Kklecks87's page

You certainly can retrain your feats. The only thing not in the campaign rules is it costs 1 prestige per day it takes to retrain feats, powers, etc.

I would have to agree with whats being said here. Running the AP's will give you almost everything you need to gm. (story progression, encounters, and/or skill checks) Another item if you want to just get used to gming is potentially the PFS scenarios. Granted you couldn't use any of these really as legitimate chronicles persay, but does easily lay out everything and are quick 3-4 hr episode. Well whatever way you go make sure you stick to the most important thing. Have fun.