One requirement is the presence of live fruit tree branches.
These serve two purposes -- first, they provide a natural environment
for gliders to climb and keep their teeth healthy. Being
arboreal, sugar gliders absolutely need branches to climb around
on to be physical fit. Plus, it fun to watch them run around --
they are extremely coordinated and excellent climbers. Secondly,
like other small animals, glider teeth never stop growing and they
need something to gnaw on. However, unlike hamsters and bunnies,
gliders won't touch anything artificial -- they want the real thing.
The best thing to use are wild apple and sassafras branches.   I have 
also been told that oak tree branches will also work.  However,
whatever you use DO NOT USE ANY BRANCH THAT HAS BEEN SPRAYED WITH
PESTICIDES. In the wild, gliders chew the bark off trees looking
for insects and sap, so the branches will keep them occupied while
your not around.