I believe there's currently a bug in the autofit on master pages in CS6 so even though you should be able to set what you need, the settings are ignored.
1. Yes, draw the frame and choose Object / Fitting / Options. This should work, but be aware that if the frame is on the master page and you insert the image in a document page you have to 'release' the master page frame on the document page ( Ctrl/cmnd- shift click).
You can also choose not to draw a feame on a master page but instead simple choose File / Place and select the image(s) you want and start dragging out a new frame.
2. Simply Chosse Load Master pages from the fly -out menu in the Pages panel, choose the document from which you want to import master pages (but be aware of different page sizes of course!).
Thanks for the replies guys.
I wonder whent hat bug get's fixed.
Speaking about master pages, I can't get to even save one master page so I can load it in other documents..
Should I make a template instead and load that everytime I want to make a new document that is similar in appearance?
I just wanted to get one more thing straight:
If I create a document with certain master pages and create let's say 20 pages created from master pages and add in some paragraph styles etc.
If I want to use that as a starting point again and again, should I save it as a template?
That's the whole point of saving as a template right?
Yes it is.
The difference between a template (.indt) and a document (.indd) is the default opening behavior. For documents they "open as original" so you are overwriting your previous work as you edit. Templates open as an untitled copy to protect the original from unintended changes. You can convert from one behavior to the other simply by changing the file extension and you can always choose to open as a copy or as original for any file in the open dialog.