So I want to put sv_cheats 1 on my server on gmod but when I do everyone can use it. Is there anyway only the creator of the server can be the only one to use the cheats?
sv_cheats is a server side flag. That means it's set for everyone that connects to the server, no exceptions. You likely want to do some investigation into Admin Mods like ULX and Evolve which can give you cheat like abilities but only for "Administrator" users you choose.