No offense, but you seem pretty new to rabbits, I don't think it'd be a good idea to get another rabbit just yet. Also, if you have limited space, with only room for one bunny... Then another one may not be the best idea.
Maybe get your current bunny neutered first and then adopt a friend for him 2months after.
I said 2months because thats how long their hormones will die down after neuter.
If you can adopt a spayed bunny, then it would be easier for you to bond them. If the bunny you'll be adopting is not yet fixed, then I would suggest to keep them in separate enclosures until adopted bunny is fixed