Currently Being ModeratedMar 8, 2013 9:44 PM (in response to MatthewO33)
You might start by reading this: http://www.guardian.co.uk/technology/gamesblog/2009/feb/10/gameculture-apple
I would check out the refurbished section of the online Apple Store before buying a used one from Craislist. They go quickly so you have to check often. It will be more than sufficent for you to work with.
There are more than a few such books, go to a book store near you and browse them yourself to see which one works for you.
For items 3 and 4 wait until you are ready for a commercial app and then seek help from a lawyer and an accountant.