Beginner dartfrogs?

[tylototriton]

1) P. terribilis are phenomenal starter frogs, so long as you can make sure they don't get too hot. Any Dendrobates sp. would be good as well (although I prefer D. leucomelas)

2) They're basically all frog safe. Focus on tropical plants that do well with high humidity and don't need seasons or dry soil.

3) Yes. Pinhead crickets work for most dart frogs, as would springtails or some similar small food source.

4) Check the care sheets here or do a google search. There are good resources out there. I know there are some books published by reputable breeders that are pretty inexpensive, but i don't know what they are like for content.

Lighting is for the plants. You want a bulb with a temp of about 6500K, that should provide the best plant growth.

And pebbles would be fine, they just make for a very heavy tank.

Cheers!
Alex