Terrarium Rocks

I have a 45 gal hex (corner) aquarium that I would like to turn into a terrarium. Id like to do tropical, not desert like. I may eventually add a lizard, but that is undecided.

So, where do i begin? What do I need to know? What plants work best? Where do I find the plants and supplies? Where can I find a rock wall, or how to create one? What are my options as far as critters to live in it? (keeping in mind that I do not want a water feature in tank) but a small water dish-like thing would be ok. The tank gets a good amount of indirect sunlight, do I still need special light bulbs?
What are some common "problems" that I should be aware of as to avoid?

Thanx in advance!