That is really good news he is getting a buddy! He will be so much happier and you will definitely see a change in him.
When you bring the new glider home, you keep them separate with the 30 day quarantine. No shared contact or contact with each others things. Even when you have one of them out of the cage for play time you will want to change clothes and wash hands, arms, to avoid any cross contamination. If they have contact and the fecal test is positive then both will need to be treated for it.
Separate rooms is best, but as far away from each other like opposite ends of the room will work too.
It is recommended to do the first vet check with a fecal testing(basically a wellness exam and to establish your pet as a patient at your clinic, many vets will not see your glider in an emergency unless they have been set up as a patient there.)
The fecal testing is done again at the end of 30 days so you can make sure they are clear of any parasites that may have shed out after the first testing was done.
For the second testing you may be able to just bring in the stool sample for testing and save yourself an office call charge, so ask your vet.
After you get the all clear from the vet on the fecals, then you can start the scent swapping.
You then start switching their toys and fleece sleeping pouches and any fleece hammocks that they use so they get used to the other gliders scents and then by them sleeping in each others pouches...their scents combine so they will have a "new colony" scent so when you introduce them face to face after about 1-2 weeks of scent swapping they won't smell like strangers and have to fight to defend their colony/territory.
You can then also move their cages to the same room/next to each other a foot apart so they cant grab each other arms, legs or tails and injure each other but they can see and talk to each other.
Here is some helpful links to check out when you get a chance...
http://www.gliderkids.com/WhyQuarantine.pdf
http://www.sugarglider.com/gliderpedia/index.asp?IntroductionsByLuckyglider