Do you think a 20 gallon (75 liter) tank would be good to start off with? Also thanks for all of the info! Very, very helpful.Ok. You will need:
A tank ideally with a rimless top
Plants. Ask your lfs what are the easy ones.
Some substrate(I use kids plays sand) make sure to thoroughly rinse it though.
Some fish. A small amount to start off with. Depending on what size tank you decide to get.
Some plant fertilizer. I use Tropica fertilizer.
You may want root tabs for long rooted plants to help with growth in the sand.
Let me know what else I can help you with.