Any diet plan should be appropriate to age and metabolism. Young rabbits can be fed pelleted feed and hay free-choice. Rabbit pellets are the safest choice for youngsters. Purchase them from a reputable pet supply or feed store. Dietary needs for most species change with maturity.
Nutritional requirements are more than adequately met with commercial rabbit feeds.
As much as your bunny needs digestible material, he also needs a large quantity of less digestible fiber. Hay and straw provide both, but select them carefully. Pellets already have large amounts of digestible protein and more than enough calcium and vitamin-D. Alfalfa and clover hays are usually too high in protein and calcium to be given in large amounts to mature rabbits in conjunction with pellets. Fresh fruits and vegetables are a welcome addition to nearly any diet plan. Most of what you find in the produce section of the supermarket is OK for your rabbit.