With a 10 gallon tank, 1 frog is plenty. If you want more, you'd have to get a bigger tank going.
If it is an adult, you could feed him every other day, if he's a juvenile, you'll want to feed him daily. Make sure you're dusting your crickets with calcium powder a few times a week.
You don't need a uv light since they are nocturnal, if you get a calcium supplement with vitamin D, you'll be just fine there. I use a 50 watt blue daylight bulb for my tree frogs.
If you put a pond in, make sure it is filtered or you change the water often...they like to use their water as a toilet! They don't need a waterfall, though my frogs sure love theirs.
Pothos is a good plant because it has nice broad leaves for them to jump on. My frogs tend to like their ficus plants the most, but they have pretty much destroyed them after just a month! You just have to make sure you get a few tall plants in there and some branches. My tree frogs don't even touch the ground in the tank unless they are hunting, they always stay up high.