Welcome, welcome. I'd say two good ways to start would be by trying a lot of teas and seeing what kinds and styles of brewing you like, and might like in your future tea house.
And post in the 'planning' forum when you're getting things closer! Until then, lots of notes, notes, and more notes about plans and more plans. Seriously. It's better to have too much information sometimes that you can sort through and narrow down, than come across something unprepared.