It’s disappointing to see that this forum hasn’t developed enough to attract the people who could have answered your questions.
In the meantime, have you found out what you wanted to know elsewhere? Are you making progress?
If you’re not making as much progress as you’d like – or would like to have more options to choose from – let me know. I can probably suggest other places you could ask your questions to better effect.
I’ve helped a lot of young people clarify what they really want to do over the past 40 years. That’s the really hard part of jobhunting. Once you’ve got that clear (at the heart level), the rest is usually straightforward.