Your boy bun must absolutely be neutered first. Even if the girl bun is speyed so she cant become pregnant he will hump her no end and it could end up in a nasty fight as she will get very fed up with it.
So neutering him is your first step. Boy bunnies can also remain fertile for up to 6 weeks post neuter i think so best not bond for 6 weeks following the neuter.
Re. the bonding. I'm not sure if you would like to get a rescue doe for your little man? If so then there are some rescues I think that will have Bentley once he's been neutered, come stay for a few blind dates and Bentley can chose his own wifey bun
That way is probably your easiest option and the rescue could talk you through what to do when Bentley and his new wife come home. (wifey bun if from a resuce will probably already speyed etc which is another advantage)
Or once Bentley is neutered ( I really wouldnt get one beforehand as you'd just have to keep them completely seperate until Bentley has had his deplumming!) you could get a doe but problem is if not from a rescue you've no way of knowing in advance if they will get on so you could be left with two single bunnies who dislike each other
so you'd have to be prepared for what you would do then.
But if you were to do it yourself the bunnies would need to be introduced in a totally neutral space where neither of them have been before and they would need to remain in that area for perhaps a few days until they seem relatively happy together. During this time chasing, humping and fur pulling is normal. Face to face locked on fighting and drawing blood isnt and bonding may have to be abandoned. If you do a search under bonding on the forum I'm sure you'll find a whole host of stories!
When they move into their permanent accomodation this will have to be neutral too so if its where Bentley lived previously it will have all had to have been cleaned and scrubbed (white vinegar helps get rid of scent) so it seems neutral perhaps with all new toys etc because otherwise if it is not it could casue territorial fighting.
Bonding can be quite a nerve wracking experience and if you can enlist the help of a rescue or a person experienced with bonding I would always recommend that.
Sorry I am rambling a bit.
Does any of that help?
ETA sorry just seen you're in Canada! Are there any bunny rescues near you? I was rabbiting on before presuming you were somewhere in the UK.