It's not clear exactly when you moved. Unless you moved on December 31 or January 1 you will have to file a part-year resident return in Maine for the year that you moved. Any income that you received while you were still a resident of Maine will be taxed by Maine. Any gain from the sale of the home in Maine is subject to tax by Maine, no matter when you sold it. (I don't know what Maine's rules are for the gain from selling your home.)
You said you lived in Maine "all year." For whatever year that was, you have to file a regular Maine resident tax return and pay Maine tax on any income that you received in that year.
You do not have to pay Maine tax on any money that you take out of your IRA when you are no longer a Maine resident.
If you have further questions, please give the exact dates that you sold the home in Maine, moved to Florida, and bought the home in Florida. Also clarify which year's tax returns you are asking about.
