1. Usually my mom is the one who tries to sell them, but I've been helping more. If you go to any rabbit shows, you can try and put them on the raffle table if there is one. If not, write on a paper, chalkboard, whiteboard, etc. that you have a rabbit for sale.
You can also try and make a post on Rabbit Talk. Another idea is making a YouTube video about it if you have a channel.
2. I don't know where we got them, but we have paper pedigrees that we use