Sugar Gliders are wonderful furries with a lot of personality but they can get very tempermental sometimes if they don't get their way. When looking for one, their coats should be shiny and look healty, clear eyes and all the other basics you'd want to look for pretty much like puppies..
The link below should actually help you out...this is from SunCoast Sugar Gliders..they are great people and Lisa (the breeder) has a ton of experience with gliders...
http://www.sugar-gliders.com/sugar-glider-care.htm