Hey! I've been looking for the same info as you. I posted a question a few days ago and received one response from unknownxcelebrity I found really helpful. I'm sure they won't mind me copying and pasting it here:
"First of all, introducing unneutered males is extremely difficult. It took me four months to get my two males to get along and that was only after I had one nuetered, which is something you should do if you're thinking of having an all male colony because they're agressive and will fight no matter how "sweet" they may seem. Plus it makes them smell better. I recommend doing this before you get any more gliders and make sure the new ones are nuetered as well before you introduce them.
"Also, they should be old enough to be neutered, your vet will be able to tell you for certain.
"For a colony size, it depends on you. If you have a cage, funds, time, and the ability to care for tweleve, then have that many. But if you have a cage built for four gliders, a glider fund that cover four sick at the same time, etc, then get four. It's whatever works for you.
"As for an age, just make sure they're all the same age or close to the same age and size so they can hold their own against the others.
"Females and nuetered males have the same problems that females with unneutered males have, save the joeys part. The males will fight with each other when the female(s) go into heat and can injure each other. If you already have two males and want to keep your colony in the same cage or room, stick with males.
"When you bring home new gliders they need to be checked by a vet and kept in a different cage in a different part of the house for at least thirty days before going back to the vet to make sure they don't have any illnesses or parasites that could harm your original gliders. But when you do introduce them, do it slowly, switch pouches out so they get to know each other's smell, then let them meet each other during tent time or bathroom time. If all goes well, then they can have a sleepover in the same cage, just watch for any serious fighting. Meaning two gliders in a deathlock, yelling and crabbing at each other while rolling around on the ground; they will "bicker" a little/a lot at first but that's usually just asserting dominance and finding out who will be the "leader" of the colony. This happens more frequently with unneutered males."
Hope this helps! Hope someone else posts their knowledge as well, as I'd like to do a great deal more research on my next gliders than I did on my first two (thank you, pet store :( boo!)