Hello and welcome to PC gaming!
I would highly recommend following this guide to learn how to mod FNV:
Viva New Vegas
It will get you going and show you the ins and outs of modding a Bethesda game. HOWEVER, I cannot recommend everything Qolore says in the guide. While it comes from good intentions, some things are just his opinion (such as whether or not to use ENB). But for a base to start from, this a good foundation to build from.
Stay away from anything made by Sinitar.
As for Brave New World, dragbodys mods are not required. If you want to use them alongside the BNW then you can download them here, they should all be in "Fallout Modding". The BNW installer is simply asking you if you want to install the patches to make dragbody's mods to work WITH BNW but they are not required to use that mod.
Best of luck!
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When you're lost in the darkness... Look for light