what kind of chameleon are you getting. it is also recomended to keep cams in all or semi screen cages not full glass. ficus is a good live plant to use live plants will help to keep humidity up. u also need a uvb sorce like a repti sun 5.0. captive breed veiled/panther chameleons are recomended as a starter chameleon.
My live in a glassterrarium (which may not be the best alternativ) but with good ventilation (one of the problems otherwise). The other problem that can occur in glasstanks i reflections in the glass which can be stressful for your cham. My solution to this problem was to use a plastic material which you use in bathrooms. You can see the result in the link.