First things first: get your little guy neutered, then start saving for a friend. Read up on quarantine and introductions. Be aware that for the quarantine period, since they're in separate rooms, you'll have to have two of
everything: cage, cage sets, water bottles, toys ... it can get pretty expensive. So get the neuter out of the way; it's really important if you're going to get him a companion of either gender. Then start looking for a rescue or rehome, preferably one who's already neutered; even better, one who comes with cage and toys etc. Good luck!