Bleg: Small robotics or small electrical experience?

Any one out there with small robotics or electrical experience who’d be willing spend a few minutes to help me set up a wiring diagram for a project?  I can PROBABLY figure it out, but I’d appreciate assistance in making sure I’m getting it right…..

I could also use a link to a decent source for “stuff”, such as a (dimmer type) power control knob, etc….I think I miss Radioshack!