AVO VS vivanewvegas-wabbajack

If you don't want to spend too much time modding you could try AVO or Aurora.

If you're open to using a wabbajack modlist to give you a graphic and stability baseline for your modlist, Animonculory Visual Overhaul might be what you're looking for.

If you just want visuals AVO NG and Aurora are good options. If you want content and gameplay changes in addition to visuals try Elysium or Living Skyrim.

Otherwise try checking out the GitHub

For graphics, I love AVO NG -- https://github.com/The-Animonculory/AVO. It focuses pretty exclusively on visual overhauls, though; not much in the way of gameplay changes.

If you want an almost purely visual list to build off of, there's AVO-NG on wabbajack as a good place to start. https://github.com/The-Animonculory/AVO-NG/blob/main/Readme.md

Fallout: New Vegas is great, but I'd strongly advise doing even your first playthrough with a decent Vanilla+ Modlist, it will take an hour or so to set up, but it's so worth it. I could never get past the first 2-3 hours, before I played it with this Modlist. The game already started feeling old when it came out (technology-wise) and this fixes it almost completely.

That’s the thing with Vortex, you can’t manually manage your plugin load order. Some people find it easier for new modders, but I think it’s detrimental to creating a good modlist. I’d recommend looking through Viva New Vegas and possibly consider switching form Vortex to Mod Organizer 2.

I recommend following Viva New Vegas This will tell you how to use MO2, along with making your game be stable and work properly.

Follow Viva New Vegas up until the User Interface Section, then skip to the final steps for the load order.

Grab MO2, install mod with it, learn how to use it here

Follow Viva New Vegas, you need a bunch of prerequisites to make them work correctly and you may as well make your game more stable for 5% more work on the way. Stop after the Gameplay section unless you want the rest of the mods.

For best results ensure you follow a GOOD modding guide as a starting point. For FNV, you absolutely need to follow Viva New Vegas (https://vivanewvegas.github.io/). FO3 and TTW have guides by the same author.

However I do recommend following Viva New Vegas for general bug fixes, if you want a purely vanilla playthrough, stop at the User Interface section of the guide.

If it can run Witcher 3 I doubt it can't also run FNV. If you do get the game make sure to get the performance mods + bugfixes from Viva New Vegas.