welcome NJAngel 🙂 i’m glad you’re taking the time to learn about how to care for your new bunny. boy he sounds cute, so i really hope you’ll post some photos.
you’ve gotten some great advice above on diet – i also too prefer oxbow since it’s a very healthy choice. if he’s currently on a different kind of pellets, you’ll want to transition the pellets slowly over several weeks from the old food to the new kind.
oat hay is fine – but for his age alfalfa is a good choice 🙂 once he is about 7 months, you can offer different grass hays like oat, timothy, bunny brome or orchard grass.
this is also a good time to start researching local vets, since your bunny will be hitting puberty soon and it can take some time to find a vet who knows about bunnies. bunnies live longer happier lives and you’re likely to notice a big personality change when he hits puberty in a month or two. do you live in New Jersey? we can likely help direct you with some places to start. 🙂