First, it depends on how much money you have and what type of computer i.e. Mac or PC.
If you have a Mac, download Final Cut Pro 10, and if you have no money, get iMovie (although, you would much rather use Final Cut because of things like color correct, begin able to use multiple audio tracks, overlaying visuals etc.)
If you have a PC, go the Sony Vegas Pro 11 route, it is what I use...
(ENJOY! AND WATCH IN HD!)
Also, for what you put, do whatever you are best at the most.
I know some who slay at rails so I put the doing rails, and those good at jumps get shots on jumps.
If you want your friend to get good, have him film you and see how it turns out, then harass him about what he sucks at. He'll get good quick. If you use a fisheye remember to shoot what seems to be uncomfortably close..I used a fisheye adapter on my camera for my last edit ^^^^
All in all, watch a lot of footy, get a good program (not Windows Movie Maker damnit) and have a good time with what you do.