When I got my first rabbit I just put in a litter box and put sawdust in it right away, no bedding for the rest of the cage. And she got it straigt away.
Aroma however didn't see the point at all...she weed all over and used the litter box as a bed:roll: So I put pellets in the litter box and sawdust/newspaper in the rest of the cage but it didn't work. She's still not litter-trained...but both my other two are