Hi, and welcome to RU :wave:. I wouldn't attempt to bond the boys until they're both neutered. Then it's best to wait a few weeks post-neuter to allow hormones to settle before attempting the bond. You want a COMPLETELY neutral space in which to bond. Any room in the house will do where neither bunny has been previously. If they've both been in all rooms, you'll need to wash everywhere to remove existing bunny smells (a 50/50 white vinegar and water solution is often used).
I prefer to sit on the floor with both bunnies (I'm there to break up any chasing etc) in a SMALL space. I've bonded lots of bunnies over the years and have always found that too much space leads to running, chasing, nipping and then fighting. Normal bonding behaviours are humping, a little nipping, chasing. If they have their ears back, tail up in the air and lunge - INTERVENE as a fight is about to break out. Ignoring each other is good as is sitting or laying near each other. If you get mutual grooming then that's a brilliant sign. Don't rush to increase the space as I've always found that too much space, too quickly, leads to fighting over territory. Small steps a few feet at a time, until you think the bond is fairly good.
I normally allow a week for bonding (I take a week off work) and I have the airbed read so that I can sleep next to them. It's generally best if you keep them together once you've started the bonding process and sleeping on the floor next to their bonding pen means you can keep a close eye on them throughout the night. Once they've been together for at least 48 hours WITH NO SCUFFLES and are showing all the right signs of being bonded then consider moving them to their permanent accommodation. Move them with a dirty litter tray that smells of both of them and even scatter a little dirty litter around the (fully nutralised) enclosure. Expect a little territorial behaviour and be on hand to interveve. Bonding can occur in a few hours or can take weeks. Good luck, don't rush (be guided by the bunnies) and it'll all be worth it in the end.