I’ve been trying to find a thread on another forum for you about someone who bonded five rabbits, but for the life of me I cannot find it. All I know is, that once you have a slightly larger group of rabbits 4+, bonding tends to become easier with each additional introduction.
In terms of where to begin, I honestly don’t know if it’s better to start with two together and add rabbits one at a time after that point, or whether it’s better to start by putting 3-4 together. However, I would probably suggest starting with the two rabbits that are most likely to get along. I would probably match up your neutered male with one of your spayed females, however given that he is so young, I’m not sure how long he’s been neutered. I would wait until he’s been neutered for a full two months before attempting bond him (same goes for any of the others). With your girls that aren’t spayed, you can still start the bonding process for your others and simply add those two later once they’re all healed from their surgeries. You can still however prepare them for bonding by doing scent swapping of items from their cages with the other bunnies etc.
You may even be able to bond two separate pairs, and then bond those two pairs together. Instead of starting with a single pair, then adding one, then another one. Based on what I’ve read, if you got step by step, bond 3 and 4 will probably be the hardest ones, but after that as Bam mentioned, it gets easier with larger groups of rabbits. The main issue you may have with potentially so many steps in the bonding process, is finding a new neutral territory for each new bond.
Will be very interested to read how you approach this and how things progress as you bond them together.