I'll bite.
I'd suggest you take a look at the buildblitz site.
http://www.buildblitz.com/ They've already posted a lot of good prototypes for launching and picking up the ball. Should be a good starting point. In general I recommend you start with picking up the ball from the ground and placing it back on the ground or rolling in into the low goal. These are all fairly easy task but they can make you a valuable member of any alliance. Assists really are the key to winning and seeding high in this years game. I can't tell you how to design your robot. But I'd define that as a good starting place.