i want to contribute

I see these people make vehicles and tracks for the game but it isn't released how do you do that because I would love to help in anyway I can

 

You can use the Torque(3D) terrain editor if you want to make maps. http://garagegames.com
If you want to make cars, I suggest you learn how to model in blender. You can also test your vehicles(beam/node system) in Rigs of Rods, since to test the Beam and node(which is the physics of the cars) you need the game. Although the beam/nodes will change in BeamNG.
Sorry if that doesn't make sense. If you want to make cars just learn how to model in blender and the rest will come when possible.

 

thanks that makes a lot of sense um were can I get blender if u know

 

You can acquire blender at http://www.blender.org/ .