Reading your post I get a little lost as to what is the question. But you need to decide what it is you are going to keep. Mixing different types of frogs, lizards, gheckos and such is not generally recomended. It just compounds trying to get the specific habitat correct for the specific beast. Also the natural defenses of the creatures might is likely to be hazardous to different things forced to share a smaller territory than they would in the wild. Putting small fish in the water feature is probably okay, provided you don't care if they occasionally get eaten by the frogs or whatever else is in there.

You mention tree frogs. So have you looked at Green Tree frog care and habitat articles on the web? With that knowledge you should look at as many articles as you can for vivarium construction. There are many different types of viv' construction. Some basics explained here..... http://www.frogforum.net/showthread.php?t=32167 Then you have to look at your abilities, what you already have and what you are willing to spend.

I have fire belly toads. They love spending time it water. For any frog that likes water as much as they do, I'd favor the "drainage layer" or "false bottom" construction or a hybrid of the two. My current 10 gallon (38Litre) viv just uses the drainage layer method. on the wet side there is a single layer of gravel, then for the dry side the layers of gravel are increased to just above the water level which is what I build the substrates on for the land feature.

If you are going to raise your own crickets, you will quickly have many more than you want. And the extras must be destroyed if they can't sold, given away for other to use as feeders or such. You can't just release them live into the environment. In fact you should not ever release any store bought pet into the environment and likely should not release any wild caught thing that have be kept for any length of time as a "pet". In general, IMO, most frogs live much longer in captivity than they do in the wild. You shouldn't feel bad about releasing wild thing you only kept long enough for them to heal from injury. And don't feel bad if they wind up getting eaten. That's life. Their misfortune is food and life for another.

I raise my own crickets. You will need at least three to four containers to assure yourself a brood that is feeder size for your frogs and such. Generally they hatch and live in one container until I destroy the unused. When they reach breeding age, I collect a day or two's worth of egg laying in a small container of moist coir and then move that container to a new container where they'll hatch and live for the cycle to repeat. If you have more questions about crickets ask in the forum: Food, Feeders, Live, Frozen, Culturing, etc

questions about frogs and their habitat should be ask in the forums specific to them. IE. question about green tree frogs and their habitat should be ask in the forum: Tree Frogs