Modelling Questions

I am new at modelling, i need help, i dont know what programs to use, is it possible to use sketchup as a model creator?

Blender, 3DS Max are the 2 I can think of. Though I’m sure there are plenty of others out there.

Sketchup wasn’t really made for created models to be used in games but rather to make quick 3d architecture layouts any such. It is 3d data and it can be taken to Source but you’ll most likely want to transfer it over to another program such as 3ds max for some editing and touching up first.