You need an updated version of Fallout 4.  No other DLC or mods are required.

Outcasts & Remnants is a companion to Fusion City Rising, but you can play either mod first, or both at the same time.  Same with Project Valkyrie. As of v1.10, OAR doesn't require FCR in order to work.

The stories in both mods run parallel to each other and stand on their own.  A few NPC's and terminals in Outcasts & Remnants make reference to Fusion City, and those references will make more sense after playing Fusion City Rising, but you can play either mod first, or both at the same time.

We also recommend CBBE but it is not required.  The mod has a few NPC's in outfits that use the CBBE UV maps.  Without CBBE, the skin textures will look weird on those NPC's, but there are hundreds of NPC's in the mod, so it shouldn't materially affect your overall enjoyment.

If you don't like the body variations CBBE offers, you can install the CBBE Vanilla Nevernude body, and that will give you basically the same body as vanilla, but with access to more outfits, since most outfit mods are CBBE based.

If you have a strong preference for one body type over another, that's cool.  No need to leave a comment.  Everyone has their own taste.  As mod makers all we can do is try to make custom outfits compatible for the maximum number of users.