Custom swep making from tags/ or how to lua?

i really want to make sweps for gmod but i have no idea how to do so, is it possible to convert halo ce tags into gmod sweps? if not can someone teach me how to lua so i can make ones from scratch?

This one can’t help newbie Lua coders but can help ones who forgot functions. http://maurits.tv/data/garrysmod/wiki/wiki.garrysmod.com/index4af3.html