TTT server HELP

Ok so I have set up a GMod server on my computer, people can connect to it, i have ULX installed fine, but atm the only thing I can do is sandbox on gm_constuct or flatgrass… I run it from a .bat file on my computer (no wishy washy “server company” just my 2nd computer and garrysmod) and I don’t really know how to add new maps or change the game mode from sandbox to ttt. Although I do know the config file you need for ttt. Also is there a certain thread or website where I can get maps?

write in the server console (not in-game console)

gamemode terrortown

then:

map de_dust2