Aww! He is so cute!
I would only give him 1-2 tbs of Burgess pellets and unlimited timothy hay for now. He really needs to eat lots of timothy hay since that will be the main thing he eats for the rest of his life.
Since the mom rabbit ate some veggies, you can give him a few, but I would be extra careful so he doesn't get sick. For
veggies, the best options are dark leaf lettuces -no iceberg-, turnip greens, mustard greens, carrot tops, cilantro, and herbs. Stay away from all fruits and store-bought treats (I would always stay away from store-bought treats, even when he is an adult since they are full of bad ingredients).
It is normal that he isn't molting. Rabbits only molt 2 times per year, normally in the spring and fall. For brushes, check out these links:
Grooming Suggestions??? Allergies Out of Control!
Best brush for Mini Rex?