Black-Rain-Frogger is right. Mold pops up from time to time, and is more prevalent in the beginning.
As far as plants, there are epiphytic plants (air plants like Superfly said), and there are terrestrial plants, and then there are aquatic and semi-aquatic plants. For someone new to the hobby, I would reccommend semi-aquatic plants for planting on the ground. If you over water, they wont die. If there is not enough water, then you animals won't be happy either.
Air plants usually get mounted on tree branches, on rocks, on gravel, and most often on backgrounds. In order to keep these alive, you simply mount them so that their roots or stalks are exposed to the air, and let the roots attach themselves to the tree branch, rock, or background. To keep them happy, mist them/spray them everyday, but also let them dry out everyday. The most common air plants are bromiliads, tillandsias, vines, and orchids.
Don't hesitate to ask more questions. I know I didn't give you a full answer.
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"Kings made tombs more splendid then the houses of the living. And counted the old names of their descent dearer than the names of their sons."
-J.R.R. Tolkien
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