If a person has a felony you cannot own a gun. It does not matter how long you have had the felony.
Not in Flordia, nor in any other state.
(note I am not a lawyer) You can not own a firearm in Florida with a felony on your record, however if it is a non-conviction, and is your only offense, you may be able to get a lawyer to seal/expunge your record and get your rights restored. This does cost between $600 and $2000 depending on complexity of the case.
No
No
No. No convicted felon can ever lawfully be in possession of a firearm.
Never
No.
Not in the US. If you have been convicted of a felony, it is a violation of Federal law to POSSESS a firearm. Own, yes, possess, no. Covered in 18 US Cobde, section 922.
No. Federal Law says that anyone convicted of a Felony is ineligible to own a firearm under the Brady Handgun Violence Prevention Act.
You need to get a lawyer.
They can forbid you to possess any firearm.
You can't really "check online" but if you qualify to own a firearm anywhere in the U.S. you can own one in Florida. Basically, you have to be a non-felon and have disqualifying misdemeanors.