Where do we file if we were married in Nevada but I now live in Florida? His truck is in my name, how do I make sure he is responsible for it?

Place of marriage is largely irrelevant to the place of divorce, which depends on residency and jurisdiction.  See "The Basics of Family Law Jurisdiction," posted on http://willicklawgroup.com/grounds-and-jurisdiction/. As for specific property and debt distributions, it is VERY dependent on the law of the state of divorce; you will need to consult with a family law specialist in the place of divorce.