Nostalrius Begins - Quality wow vanilla realm (1.12)

So I decided to get some addons but when I went to put them into my game files there were no folders for my "interface" so i made one then put an "addon" folder inside of it then proceeded to put my mods in there. However they are not loading into the game. Am I doing something wrong?

That folder is in fact called AddOns

I also have problems with my addons not loading. I use wineskin on my Mac

Have you checked the "load out of date addons" box on the menu - addon screen ?
Do your addons need some missing libraries?

any addon is 3rd party application which is not part of the server itself and will not be supported by server staff members. follow the steps mentioned above.
Please next time use the General Discussion forum.

Your WoW folder directory should look like this regarding addons:

World of Warcraft Classic\Interface\Addons\<all your addon folders>

Are you sure you created a folder labeled "AddOns" with an "s" ? From your original post, it sounds like you only made it "AddOn." Also, there can't be any extra layers of folders between "AddOns" and the addon folders themselves. Like if you unzipped/extracted addons from a zip or rar file, you have to copy/paste the folder that contains the addon files themselves, not the unzipped/extracted folder.

A correct addon directory would look like this:
World of Warcraft Classic\Interface\Addons\Auctioneer
World of Warcraft Classic\Interface\Addons\Bagnon
World of Warcraft Classic\Interface\Addons\Questie

An incorrect addon directory would look something like this where there's extra folders padded between the directory:
World of Warcraft Classic\Interface\Addons\Vanilla Addons\Auctioneer
World of Warcraft Classic\Interface\Addons\Addons\Bagnon
World of Warcraft Classic\Interface\Addons\Questie\Questie