Headstart Helgen Keep: Clean-Save,

Save Made with Skyrim LE; Update.esm; Dawnguard.esm; Hearthfires.esm; and Dragonborn.esm ONLY.

Starts After Alduin's Attack, during the First Quest: UNBOUND.

Your character is in Helgen Keep's first chamber, with the first gate locked, Ralof Waiting. You have the keys to the gate.

Clean-Save Features:

Player-Character: Female Nord Named Dragonborn: Use Race Menu to change as desired, but NOTE the risk.

NOTE: If you change the character's race, you will retain all perks/abilities below, but skills-values will revert to
Skyrim's starting levels for your new race!

Despite all but four maxed out skills + perks below, the Player has NOT leveled up yet, and is still level 1:

You can stay level 1 for as long as you want, but before you access the Skill Trees and Level up, perhaps make another
save first, so you will have a backup of this original clean-save at level 1, if you change your mind, since you will have to next level up Health, Stamina, and Magicka.
Please note that you will jump from level 1 to Level 71, and end up carrying about 30 unused perks. You will never use/need all of these, as you continue playing.

Here follow the starting Skill Trees and Levels And Selected Perks for this particular player-character-save:

Destruction: 41: All Perks up to 40
Restoration: 100: All Perks except Avoid Death
Alteration: 100: All Perks
Enchanting: 100: All Perks
Conjuration: 100: All Perks, but meter-bar not filled in. (?)
Illusion: 100: All Perks; and Master Spells: Harmony, Mayhem, Invisibility.
Alchemy: 100: First 5 Perks, plus Poisoner, Physician, and Benefactor, for Resto-exploit.
Speech: 20: Instantly upgradeable to 100 when you reach a merchant with your vaulable inventory below.
Pickpocket: 100: All Perks
Lockpicking: 15: Easy to level up, see below.
Sneak: 100: All Perks
Light Armor: 100: All Perks
Archery: 100: All Perks, but meter-bar not filled in. (?)
Heavy Armor: 100: All Perks
1-Handed: 100: All Perks
2-Handed: 91: All Perks through 90 (After about five-ten minutes of 2-H game play, should bop up to level 92.)
Block: 100: All Perks
Smithing: 20: Instantly upgradeable to 100 when you reach a grindstone/workbench, and choose to use the OP alch-smith ring/potions in your inventory.

Standing Stone Already Activated: Warrior

Once you finish Escape Helgen Keep--UNBOUND with Ralof, you can fast-travel to the three main Guardian Stones if you wish.

Inventory:

You have enchanted leather-armor, helmet and boots, and enchanted Daedric 2-H gauntlets, enchanted ebony bow, sword, and shield, along with Bound Bow/Battleaxe.
Your starting armor gives you 257K-plus health, 359K magicka, 359K magicka-regen, 359K stamina, 215K carry-weight.
You have a 200K alch-smith ring, that will make expensive potions or get you to 100 Smithing within six clicks at a workbench or grindstone at a smithy.
You also have OP smithing and enchanting potions that you can use to likewise more slowly level smithing or upgrade armor and weapons.
Tou have lots of necessary Alchemy ingredients for Slow, for Restoration, Smithing, and Enchanting potions.
You have loads of enchanted rings and boots, and potions that you can sell (one-shot) to raise Speech to 100, when you're ready, in Riverwood, or wherever.
The nearby thralled Imperial Captain also has a bunch of expensive and salable gear and items they are muling. A thralled soldier is there too, no gear.
Take good care of her/them, if you want. If they're standing there when you load the save, you may have to kill and rethrall them to get them to follow.
If you don't want them, or don't want some or any of this stuff, just leave them, and leave the other gear in a chest in the barracks at Helgen.

Tips and Options:

1) You could visit the wiki and learn and use the console-command to reset all perks and levels back to a starting character. Just toss your inventory,
if you prefer grinding and leveling up!
2a) You could play a whole game--or as many quests as you want--without accessing the skill tree, and all enemies will be scaled around your level-1 range,
while your character's actual skills-perks-sets are nearer 70. If you prefer tough opponents, level up.
2b) You could "beat" the game, and Alduin, at this "level 1."
3) You have some skills that still need leveling/grinding, such as Destruction, Lockpicking, 2-Handed, Speech, and Smithing.
4) With Dead Thrall you can thrall the Imperial Captain and other Imperial Soldier or Gunjar in Helgen Keep, if you wish, before unlocking the gate.
5a) With the advanced Illusion Spells, you can cast Harmony on your way out of Helgen, and not kill any NPCs/anything.
5b) As a Master-Illusionist, you could play a lot of the game without killing much of anyone/anything.
6) You can use this save to test Mods and load orders or other.
7) Unknown Lockpicking Tip: Very easy to level up. If you set your volume up, you will hear that Skyrim plays an audible pitched cue
when the rotating lockpick-graphic passes the correct opening position. The on-screen lock-graphic is drawn with lots of visual cues for precisely targeting your pick.
8) Without the Mage Stone, or the Lover Stone, activated, leveling up Destruction WILL be a grind. Perhaps make some potions to speed the process.
9) Leveling up the rest of 2-Handed is a bit of a grind too, even with the Warrior Stone activated. Perhaps make some potions to speed it up; and get some sleep.
10) You could travel and visit merchants to level up Speech, sell your gear, and get lots of gold.
11) Little-known Pickpocket tip: if you prefer to grind pickpocket and level it up, then casting Harmony on NPC's and enemies allows you to much more easily pickpocket them.
It's fast and easy to walk to Winterhold, casting calm all the way, max out Illusion, get the Illusion Ritual master spells from Drevis Neloren, and then use Harmony throughout
Tamriel to pickpocket everyone. I like to cast Harmony, and then pickpocket everyone at Karthspire Camp. Very fun! If they catch you, recast it! This is faster and safer most
often, than saving before each pickpocket attempt, and is also much faster and more fun than going to Riften prison, killing guards and pickpocketing Sibbi. Note, if you choose
to level up, the enemies will scale up too, and be harder to pickpocket, even with Harmony. So do this early, while you are still low level, except in Illusion.
12) Another little-known Pickpocket tip is to travel to Windhelm, level up 1 level at a time, by using the Restoration exploit in the Alchemist's shop, save, and punch the alchemist
to reset his inventory, reload your save, then sell your potions back or outside in the market, to earn the money necessary to buy Pickpocket training from the nearby Silda,
five levels at a time. Once you max out her training, you can then complete 91-100 Pickpocket mastery using the Calixto exploit.