Green tree frog - Care sheet?

[Gnag the nameless]

So, me and my friend have been at the pet store recently, and he's been wanting to get a frog, see [He's jealous of me; Gnag and Bumpy are awesome ] and we then we saw these 3 Green Tree frogs [Correction: Hyla Cinerea], which are roughly 0.8-1 inches long when squatting. Of course, he's now planning to get those, so here is a list of questions I'll need answered before we get the frogs:

-What kind of substrate? And where do I buy it?
-UV lamp or not?
-How much water?
-Where to buy wingless fruit flies? Or do I use small crickets?
-Fogger or mist-machine?
-Any special vitamins needed?
-How to mist a tank?
-How big do the frogs themselves get?
-Are they territorial?
-How big of a tank for the three of them when they become adults?

Anything else we should think of or get?

We already know we'll need non-chlorinated and not distilled water, as well as a thermometer. He's getting a 10G ASAP, and as soon as he does, I'm going to be helping him add foliage and wood to liven it up. We can definitely get a lid for the tank, or a 20G instead of a 10G, but it will take time for us to get a good 30G or more.