Haha, yes, that's a fine fat shiny snake! Although if he's truly 11 years old he's very short, or maybe you're just underestimating. It can be really hard to get a length---they don't usually cooperate by lying still all stretched out! If he's a full adult he can have small rats, if you feed mice he'd probably need 3 or 4 depending how big they are. So it's easier and probably cheaper to buy a rat. If you continue to feed live make sure to supervise until the rodent is dead; a ticked-off rat can really tear a snake up if left in the enclosure unsupervised.
Congratulations on your introduction to snakekeeping!