Hello,
You have a lot of different scenarios here, and you're also asking different questions. This gives the thread trainwreck potential
For the legal perspective, I'd start by reading
Title 18 and searching the forum for specific points that you want to know more about. If you can't find what you want then folks here are always happy to help.
One other thing: this thread probably belongs in the General or Concealed and Open Carry sections. Pistols is for technical discussion of handguns. A mod will probably move it for you.