Where do I need to file my divorce?

Not enough to be sure but safest to file in PA.

The first question is whether the divorce can be uncontested. If so, it can be filed in FL. If not, it might have to be filed in PA.

You can file in FL, contact me for consultation.

That would depend upon whether or not there are children and where/with whom they reside, where all the assets are, where all the debts are. If you are now a resident of Florida, you can certainly file in Florida, but consider if that filing in Florida is in your best interest, in the best interest of the children, if any, etc. It's not cut and dry.

To file in FL, you have to have lived here for at least 6 months before you file. Also, if you have children from the marriage, or property, assets or liabilities that need to be equitably distributed, the FL courts may not have jurisdiction to determine those issues because your wife has no connection to FL, the children are in PA, and the property, assets or liabilities may be in PA. If you have no minor children together, and there is no property, assets or liabilities that need to be addressed by the court, and all that needs to be determined by the court is dissolving the marital relationship, then if you have been in FL for at least 6 months, you can file in FL if you choose, and can probably file in either State, assuming that your wife has been in PA long enough to meet PA's residency requirements.