You'll have to take them out one at the time if they're not bonded and rotate their time out. That's what we do for all our new guys. It's important to be calm and patient with him and give him lots of licky treats (like baby food). We also feed yogurt drops and mealies by hand, which they love.
You can use the time you're bonding with him to find a vet who knows what gliders actually are. They do need vet care and it's important to have a vet that can provide them with good care -- and the time to be looking for a vet is not when your glider is cold on the ground and dying, but when they're healthy and you can find the best vet.
We are as gods to the beasts of the fields. We order the time o' their birth and the time o' their death. Between times, we ha' a duty. - Terry Pratchett.
"Men have forgotten this truth", said the fox, "But you must not forget it. You become responsible, forever, for what you have tamed. - Antoine de Saint-Exupéry