Setting Goals

I learn best when I see results. Exercises do not hold my interest. So before I could get started, I had to make a list of modifications that I wanted to make to the WPF 2D Physics demo. Here is what I wanted to achieve.

1) Click on any body in the world to make it disappear
2) Click and push any body
3) Drag the body

I had absolutely no idea on what I would need to learn in order to achieve the above goals.