Each state has different residency requirements before it will assume jurisdiction in a matrimonial case. In NY, you must be living in the state for one year.
Check to see what FL’s residency requirement is. Once you have satisfied that residency requirement you can file there.
Your question regarding Spousal Support (Alimony) will depend upon several factors such as the length of the marriage, who was supporting the family when you were living together, the discrepancy between the incomes, etc.
It does not depend on who is the plaintiff and who is the defendant.
Leonard M. Weiner, Divorce Solutions