/vr/ - Retro Games

I want to piece together a gameplay mod to my personal taste from other existing gameplay mods.

Without knowing any code and having no experience whatsoever, how many hours would it take to read up on Doom modding and fuck around enough to be capable to do something like that?

Just pasting together bits and pieces that already exist without actually creating any new content. How difficult or easy would that be and where do I start?