assistance with making my own DLC pack

first off i wanna say i'm not 100% sure if im posting this in the right area, if this isn't the right place i do apologize

So i'm trying to make my own little EUP addon pack, i've already gotten past the .ytd and .ydd files and like making the textures for clothes and so on. now i gotta implement it into the game and see if it works. i haven't been able to find anything online to help me figure out how to set up the dlc file in open iv, i already like created the dlc file itself with Dlc Pack Creator, but that just leaves me with 2 rpf files one being the metadata.rpf file, and i have zero clue as to what i need to do from this point forward, again i've tried to search online without success (i might also just not know what exactly to search for to find what i need) i suppose i need some kind of guidance on the file structure needed and what meta files i'd need and so on. so if anyone has made a single player eup addon pack any and all advice or links to resources that can help me would be greatly appreciated