Hi Matt, and Welcome!
I hope you are able to find your answers here, and I wish you luck in your new endeavour! For starters, you've probably already found the archives, but that's a good place to
start reading. There are a slew of books, and I think there's a list in the archives, too.
A big tank will definitely impact the humidity level in your home - we find it's actually kind of nice, especially in the winter. You may end up with a little more mold, but it's manageable.
Anyway, I need to get going, but happy reading!
Danielle