I feed my adults once a week (mostly... some of the larger ones, especially males get fed every 10-14 days depending on their size). For all of my corns I stop at large mice prey size wise.
And a good rule of thumb for breeding is 3yrs/3 ft/300g. This is just a guideline though, it can be bent, but is a good place to start, especially if you're just starting out. And post up a pic, we can definitely identify him.