Whyte Knight

Hi there,
I'm new to the site and really need some advice. I'm just going to list some questions that have come up in conversations between myself and my fiancée.
1) My fiancé is a American national and looking to take early retirement, Panama has everything for both of us.
2) I am a British national and have a while before retirement, but I have no objections to working in Panama. I am a qualified photographer and video photographer, educated to Masters level. However I can turn my hand to most, currently I am a call centre team manager.
3) We are planning to get married. Are there any special requirements regarding citizenship for either of us? Are there any citizenship advantages to being married before moving to Panama?
4) There appears to be a diverse amount of housing in Panama, we have been looking at everything from ready built to cabanas! Question on the cabanas, can you make them a main residential home or is there some locals laws that prevent that? Also, does anyone have any experience with prefab housing?
I would be grateful for any help you can give us. Basically, we need to know what to do!
Sincerely
Phil Whyte