This is going to be one long question... Actually a set of related questions... I want to make an iOS app, that will be sold on Apples App Store, (obviously). My app will store
I think that you should ask an Export councillor that's insured to give legal advice, as what you are asking for really in some of your questions is sound legal advice.
There are a number of export councillors listed at bis.doc.gov.
Also over on bis.doc.gov is an extensive FAQ that covers some of you questions (links below).
hope that points you in the right direction.