Rivet Questions

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Hi everyone, I am a newbie and just doing some research before I get started on my '75 Argosy. I have been having the hardest time finding clear information about what type of rivets to get/use on the airstream.

I am replacing the panoramic window, and I'll need to replace the rivets around the window frame. Here are my questions:

Where do I use pop rivets vs Olympic rivets?
Where can I buy the correct type of Rivets?
Do all rivet guns work with all types of rivets or are there different sizes?
How do I know what size rivets to use?

Thanks!