Hello!
All great questions, and most of which there are varying opinions on, this doesn't mean any one way is right or wrong, although much is a gray area, there are some hard facts. I'm going to start with your first question, then see how many of the others I can get to.
All answers are in my own opinion from things learned and experience.
1. All three of my gliders were rehomes. The first were a pair of females about a year old. The last one, a lone male (neutered), about 4 years old.
a. They can form a
bond, when you put the time in to build trust. It may vary in time and depth, considering individual glider's personality and experience with people.
b. Putting in the time includes both daytime
bonding, in pouch usually and out of cage time play. The amount of time you put in reflects in the result of your relationship. But remember, no two gliders are a like, some are easier going and some are quite scary when they're scared. Learning this early will help, as I just thought my one girl was spawn of satan, then after coming into the communities, learned her behavior was based on fear. This realization changed the whole outlook on her, and I began building a relationship with her. It's not a perfect one, but it's good.
2. Health issues, usually parasites are tested for through fecal usually in first
vet visit, as well as an examination -look over. Sometimes UTIs, constipation/diarrhea can be issues, and abscesses, though I can't say these are common, but ones I hear more often. Then there are other types of health issues as with any living creature, but generally, should most likely have no serious health issues.
3. A glider-safe wheel!!!! And space to run, hop, & jump. Running can include vertical, because they are generally arboreal and will climb, running up, down and across the cage bars.
4. As much as you can. I believe routines are important, but impromptu out of cage recreation is good too. Some glider enjoy out of cage time better than others. Best time is evening thru night when they have been up and about, have eaten, gone potty and have began to play, explore, ride the wheel, and also early morning before turning into the pouch. In the beginning, it may be easier for you to take them out in the earlier evening, just before they wake up for the first or second time (yes they will generally eat, maybe exercise a little, go potty and go back to nap for anywhere from an hour to a few hours), until they are used to you and you are comfortable getting them out of cage and back again.
5. Critter Love and BML are the most popular ones. I suggest research several of the
diets, and see which is easiest for you to maintain, then make sure they like it.
6. It depends on how far you are from them

Also if the glider is in or out of their pouch/sleeping quarters, and if you're a light sleeper or a deep sleeper, or somewhere in between. My gliders have woken me up some nights with barking, but it's not often and the duration of time varies. They are in my bedroom. It is possible that they bark more often than I realize and I'm just in to deep of sleep to notice.
7. Click on the highlighted word
breeders and you should get the database up. I found my girls on CL locally here in MD, and my boy was also here in MD, but found in the adoption forum here on GC.
Well, what do you know, I got to all of your questions. I'm sure you'll receive a lot of information here. Read on, and on, and on. Feel free to ask as many questions as you need.