Awesome job on your pig's cage. You are really doing right by him by letting him live in a C&C cage. I had my girls in a petstore cage at first, and wow, what a difference.
As far as Geronimo's food, your best bet is a plain pellet (avoid mixes with colored bits and seeds). The best pellets on the market are from Oxbow (Cavy cuisine for healthy pigs over a year or Cavy performance for pregnant/lactating pigs, sick pigs, or pigs under a year). Oxbow distributes to many stores throughout the country (try to find one that doesn't sell animals) or you can order online -
www.oxbowhay.com. Another pellet choice is from KM's Hayloft. Her pellets are only available online, but I've heard if you don't mind the shipping costs, they are great. You can order them at
www.kmshayloft.com. If you can not find either of the other two, Mazuri is also an option. Just make sure it is the plain pellet (Mazuri makes a mix as well).
Also, after a time, you may want to think about getting Geronimo a friend (another male or spayed female). Don't rush into this. Definately take some time to get to know Geronimo first before getting a second pig.
Other than that, welcome! It sounds like Geronimo is lucky to be your piggy. We love hearing about piggies, so keep us updated. And definately post some pigtures. We would love to see him and his wonderful cage.