how do I create a server?

Host a server, code some lua scripts or buy them of off gmodstore. Get leaks with backdoors and pay for it

you can try it by working on your own host host, buddy ..

While it may not be the best thing, you could always home host. I used to do it, ALOT. So then you could spend your money on addons.

Same problem here... Really hard trying to find addons

You want to make addons? so you must learn Lua to developing a own Addon, or you buy your addons at "gmodstore.com"

Server tips:
-buy server on site
-for friends make own server with console(so many tutorials on youtube)
Addons tips:
-blender
-make scripts