@smoscowitz said:

I want to build an entertainment center.
I would like to try and design it on sketchup.
The program opens with a perspective view.
Is that all there is?

Basics: SketchUp lets you build 3D models. The model's the thing. Usually you'll want to view it in perspective. Top, front, back, side and bottom views are also available. Xray views, too. Lots of choices, but the model's the thing.

Start with a Rectangle. PushPull it into 3D. Then learn to Orbit, Hand (not its real name, but H is the keyboard shortcut and it looks like a Hand on the toolbar and when you use it) and Zoom in and out.

I wrote a tutorial on this. It's still free.