Hi Suzy,
I suspect that, as many new users, you went ahead and tried to make a project according to your idea how it should look. Correct me if I'm wrong
Although Google SketchUp is rather easy to use - compared to other 3D software - it still requires some basic experience.
Have you gone through the interactive tutorials? If not, I would recommend you to do it, in order to have a basic understanding how this software works. I have made good experience with that myself.
After that, take some time (a few hours) to just play around with it - try to make some simple things.
When you have enough first experience, and know how things work, I'm sure that you will be able to create a project according to your ideas.
If you have specific questions, don't hesitate to ask
