Hi! I think its GREAT you are getting a second bunny!
When it comes to the bonding process – since it is your first – I am sure you want to make things as easy as possible, so I would have to suggest waiting until your bun is spayed to start bonding them. However, I must say that I am very weak when it comes to adopting buns so I can understand your situation
After I got Juli – I went to an adoption event and someone brought in Kramer because they found him on a golf course. I loved him SO much I just took him home even though he was not neutered with the agreement to FOSTER him until he had his surgery, then attempt to bond him once he recovered, and if things didn’t work, I would continue to keep him separate from Juli until he had a new home.
I did NOT attempt any introductions until both bunnies were fixed – which I think is esssential to the bonding process. A warning about this idea is that the bunnies might never bond and you might fall so in love with bunny #2 that you will not be able to give him up and then have two single buns, which is not the ideal situation for you OR them. However, fostering a bunny IS a very kind thing to do
so if things did not work out and the bunny does get adopted out it is still a kind thing to do if you can find a rescue that uses foster homes.