Feeding young rabbits

I just adopted a 6 week old rabbit and know that he is suppose to have unlimited access to hay and pellets for the time being. At what age should I start adding in veggies and limited him food intake?

mine have always had veg from moment they came out of the nest but id wat afew weeks to let your bun settle in first.x

i was told to make sure hay was always available

and due to the weird digestive system of rabbits, i was recommended to feed 100g of pellets in the morning with fresh veggies

and never any treats, espesh not when young

and i never feed her fruit either