Congratulations! I love that you call him your best friend. LOL. Mine are my obsession!
The munson feeding plan will help you know how much to feed him. I wish a had a link for one, but a quick google search will bring you right to it. I feed a little more conservatively than it recommends because I'm not trying to grow my snakes quickly for breeding, but it's a really good starting point.
You may also want to do some reading on keeping snakes together in one cage. It's called cohabitating (so you know what to search for), and there's LOTS of information on it on here. There are risks involved, which you may want to be aware of so that you can make an informed decision about whether or not you want to keep your baby with cagemates, especially if they are not all the same size, and if you don't know the gender. A quick rundown would include cannibalism, stress leading to illness, possibility of spreading illness to other cagemates (or at the very least, not knowing which one is sick), early pregnancy... etc. Again, there are people who do it, but you want to make an informed decision about it, and have the information on how to make sure you have your best chance of success with it. I'd personally love to do it, but after reading up on it, I decided not to. I just decided the risks weren't worth it for me.
You'll find tons of information and support here about this stuff and everything else that could possibly come up.

Welcome!
Edit** DollysMom beat me to the Munson Plan.
