You or your spouse begins the process by petitioning the Court for dissolution of the marriage and to distribute between the two parties the rights and responsibilities they had as a couple. There is then a requirement by the other spouse to answer the petition, admitting or denying the allegations about custody and property distribution. A residency requirement must be met in order to file in Florida.
There is no recognition of separation (or desertion) in Florida. Florida is a “no fault” state, but an adulterous relationship can affect support awards, asset distribution or custody awards.