Is it possible to use google sketchup to create things... if so could you tell me how, if you havnt got it but your realy good with making objects have a look and experiment and give me a tutorial of how to put it on the sims.

The free version of Sketchup only uses Google's format. You can't get it out in any version that will go into The Sims 2 (or any normal format - this is on purpose on Google's part), and if you're going to bother paying for the full version, you may as well get a different program that is more meant for making basic 3d models.

If you want to create objects, get Wings3D (which is free) or Blender (also free, more difficult for a beginner) or Milkshape ($25-30, very easy for beginners) and read the existing tutorials on them.