If you and the child have been living full time in Florida for the last six months, Florida has jurisdiction. Try legal aid or hire a private lawyer if you can come up with some money.
If you still have a valid military dependent ID card, you are still entitled to free legal assistance at your nearest military installation. If you are in Orlando, I would recommend going to Patrick AFB near Cocoa Beach. Air Force JAGs would not be able to actually represent you in court, but they could give you advice on how to ensure that your child receives support and military benefits (insurance, base privileges, etc) after the divorce. They may even help you fill out the Florida divorce forms to file with the court.
If he is providing absolutely no support to you at this time, you can contact his commanding officer or enlisted supervisor. While the CO can't force him to pay, he can certainly have a discussion with him about his responsibilities. This is a significant thing to do because it may have a very negative effect on the divorce process, as your husband won't be too happy about getting dragged into his CO's office for this chat. He's likely receiving dependent rate housing and subsistence allowances because of you and your child. It is an option, but only go down this road after thinking seriously about the implications.
Bottom line, get over to the JAG office at Patrick AFB for legal assistance. After getting info on your military benefits, especially for your child, there should be an office at the Clerk of Court's office in Orlando that will assist you with filling out the divorce forms to file.
Any private attorney that you hire should have military experience to ensure that your child receives all the necessary military benefits in the divorce. As long as your husband is in the military, your child should receive military health insurance.