Are there any publicly released game modes for VC-MP?

All I really want are some pedestrians and cars on the streets and if possible, some missions. I would also really like a RPG game mode.

If I would create my own script, would it be hard if all I would do is populate the map with cars and pedestrians, and probably code some scenarios/missions?

Also, how do I install those scripts/game modes? I'm new to this game and I don't know much besides setting up my own server