First off, I am completely new at this. So, I need help. I am about to build my first ever terrarium. I originally wanted to just house a pair of tree frogs , but now I also want to add a couple fish too. I plan to have a waterfall and small stream that flows into the pool of water that the fish live in. But, I don't know where to start. I've heard that I should create a false bottom and I've heard don't. What do I do? What do I need?

I want something similar to this: https://www.youtube.com/watch?v=d5QTRxbYtK8
Similar, but I don't have a tank this large.