Garry's Mod DarkRP Mod Installation

Since the new update i have yet to find a guide on how to install addons to a server, can someone help plz? Edit: I was unclear, i meant addons that are not on the steam workshop such as drug mods and wiremod.

Drugmod isn’t made for Gmod 13.
Wiremod can be found here: http://github.com/wiremod/wire
And you install it like you’re used to (extract the files in the addons folder)
But, if you are using old addons which you wanna try out (some might work) inside the folder you placed in addons, rename info.txt to addon.txt

No Drugmod? THIS IS OUTRAGEOUS!

Well I don’t know if it works for gmod 13. But it’s not ported for it. You could try to install it (remember to rename info.txt to addon.txt) and post the errors here?