Before you can start building a 3D model with Google SketchUp, you need to download it from the internet and install it on your computer.
Please read Downloading and Installing Google SketchUp for instructions.
Learning to make models with Google SketchUp
The best way to get started with Google SketchUp is to see it in action. Start by watching this video:
Many good training videos are available online for free; here’s where to find some of them:
Another great source of information is the Google SketchUp Help Center.
Visiting the Google 3D Warehouse
The Google 3D Warehouse is a website that contains thousands of pre-made SketchUp models that you can use in your own models.
Visit the Google 3D Warehouse to see what's there:
Use the search bar at the top of any 3D Warehouse page to look for exactly what you need. Click the Download Model button to download a model to your computer.
Working on the inside of your Space
Sometimes it's hard to see what you're doing when you're working with a SketchUp model of the inside of a space. Since Sketch-A-Space is all about modeling spaces, you might find the following video helpful: