This is my take on how to get started designing stages in SketchUp.  The video is long, but you should be able to watch it at 1.25x or 1.5x speed (if your device allows it) and still follow along.  I believe I covered most of the basics, but more videos will be coming soon that cover more advanced topics and techniques.

Here are the links to download SketchUp and the files I use in the video:

Download Sketchup:  https://www.sketchup.com/download/all

Big Prop File:  https://3dwarehouse.sketchup.com/model/4108f3ab-2e5a-4fce-bf19-dc368793fffa/USPSA-Big-TargetProp-File

Empty Bay:  https://3dwarehouse.sketchup.com/model/08bb67b0-0212-4405-bc46-8401dee336f0/USPSA-Small-Empty-Bay

If you have any questions, comments, suggestions, etc, I'll be happy to answer them.

Tag for later.

I started using Sketch Up a few months ago and it certainly has a learning curve.

Part 2 is out.  Part 3 should be up later today.