There are some great resources to answer your questions.
Scot Reader's "Inside T206" is a great place to start and your first couple questions might pertain to Section G which is the Distribution timeline and details when certain series were release, etc:
http://www.oldcardboard.com/t/t206/i...al-edition.pdf
The other great resource that might be helpful in answering the rest of your questions is the T206 White Borders Master Spreadsheet. Here you will find a comprehensive checklist that breaks down every card, details if its a portrait, batting, field pose and which back and series the card can be found in:
http://t206resource.com/WhiteBordersMaster.html
Hope this helps!