Hi welcome to BB
Congratulations on your new bunny!
I’m going to echo what Stickerbunny and LBJ10 said. Rabbits need high quality, high fiber plain pellets. How old is your rabbit? When a rabbit is a baby they need alfalfa based pellets but when they are an adult they need timothy based pellets. The House Rabbit Society has a good page on what a rabbit’s diet should be like and how to tell if a pellet brand is good, here is the link: http://www.rabbit.org/faq/sections/diet.html#pellet Personally, I would recommend Oxbow or American Pet Diner. You may have to experiment with different pellets to see what he likes.
Do you feed him veggies? Rabbits need a variety of veggies everyday, if your rabbit won’t ever eat pellets then he needs even more veggies to make sure he is getting enough vitamins and nutrients.
Another thing rabbits can never eat is any kind of dairy. The yogurt drops sold as rabbit treats are not okay, they cause the build up of bacteria that is harmful for a rabbit (good for a human) and cause G.I. stasis. So that’s another thing to watch out for 