You meant mta:vc, so there are 2 main gamemodes to choose from: Stunt and Deathmatch.
In stunt mode, there are no weapons, but instead of it, there are ramps placed all over the map on which you can perform some stunts. If you need more info about it - go & check it out by yourself
In deathmatch (DM) mode, there are some weapon pickups placed on the map, and a few character classes to choose with. You choose one, and what you'll do there is up to you. You can kill other players, team up with them ,try role-playing (on RPG servers, with the help of scripts), or just drive around. Just like above: if you need more - just check it out by yourself.
So basically, mta:vc is free-roam like