My wife filed for an uncontested divorce it is final in May.Should I have a lawyer to protect myself and our two minor children?

Yes, you should get an attorney to ensure that you understand your rights completely.
If you are genuinely concerned for the safety of your kids, I hope that you have already contacted child protective services in your county. If there is a genuine issue of danger to the children, your attorney can help you determine if it is appropriate to petition the court for a change in the placement. For example, it may be appropriate that visits be supervised should the conditions present jeopardy to the kids' safety.

She can certainly take the kids for a visit to Florida, but can't move them out of state without permission of the court. A hearing would give you an opportunity to object to that move.

Please contact an attorney if you haven't already - A family law attorney is experienced in handling this situations.