Aww! You are so lucky to have Flemmies! I want a Flemmy so bad!
I see in your profile pic that you have 3 bunnies together. Do you plan on housing your Flemmies with the Lionhead? If so, you will need to get all of the rabbits spayed and neutered, wait 1 month, and then start the bonding process. Female rabbits can get spayed at 5 months, and male rabbits can get neutered at 12 weeks (or as soon as their testicles drop). The reason for spaying and neutering them is that they will reproduce. If you have only males or only females, they will fight if they are not spayed/neutered.
Edit: I just saw your thread on this, sorry!