If you have read few of the posts in this thread you should have all the answers you need already...anyway:
You need only in the particular case of BR11 to use KKManager and download the 2 hotfixes, nothing else.
A collection of mods ONLY used in studioNeo, totally useless if you don't use studio.
The repack has already installed all mods/plugins you need, in the Optional Mods folder there are some plugins that you could add to the game but that could have compatibility problems whit other plugins.
In the launcher there are 2 optional graphics expansions that can be enabled, DHH and GraphicMod, they are optional and INCOMPATIBLEs whit each other, so enable only one of them. A POV mod is inside The Optional Mods folder (AI_PovX).
Don't worry, most peoples are here for help.