Friend, I don't mean this is a mean way, but if you don't know the answers to those questions right now, you're in no position to open up/start a business!
What you need to do is go to any bank's website, and check out their links/resources for "starting a small business"... most banks will have these types of links and it will guide to to the dizzying array of topics that you have to deal with/understand if you want to run a business....
I'm in Canada, so the legalities may be different, but if you can't find a bank with such resources, try this one -->
http://www.rbc.com/
They have all kind of business info resources (again, Canadian, but it will give you a start...)
Also - most lending institutions are very leery of extending business credit to music/audio-related businesses.... far too high risk for their tastes unless you already have enough capital that you don't need the loan to begin with!