Here's a short answer. Sit down with a piece of paper and write down everything you want to be able to record. And dream big because if you buy a 10 track recorder than that's what you're gonna get. You can't pay to add cheese, you can't pay to add another track you buy a whole new machine or unplug something.
Do you have a pc? If so then your limited to the amount of inputs to your mixer/ interface. And so on.
Jump on youtube and have a look at home recording.....