Florida does not recognize common law marriages.
Yes. Foreigners can marry in the United States and Spain will legally recognize marriages performed in other countries.
Yes, a common law marriage is still valid in Florida if it was legally established in a state that recognizes such marriages. Florida does not recognize common law marriages that are formed within the state, but it will recognize those that were validly created in other jurisdictions. However, if you enter a common law marriage after moving to Florida, that marriage would not be recognized.
Florida doesn't have a common law marriage, however Florida does recognize common law marriages that occurred in other states.
No
In general, marriages of U.S. citizens to anyone performed and documented appropriately on foreign soil are also valid on U.S. soil. Also in general, legally binding marriages that were performed in other countries are recognized in the United States.
Marriages and divorces performed in any state are recognized in all other states. So yes, you can.
No. You must be a resident of Florida to be appointed as a notary public there.
Yes.
NO
yes
An 18 year old who is an American citizen can move where ever in the United States they like. That aside, a person cannot "move to" Florida if they are a Florida resident... You have to live in Florida (or any other state) in order to be a "resident" of that state.