Use a regular lead/ leash, with the loop over your wrist. Avoid retractable or flexi leads. They are dangerous for you (the handler), your dog and any one (people or dogs) nearby. These leads can easily be pulled from your hand and/or the cable can snap.
Flea season usually starts in May and goes through to winter. However because of our mild winter flea season has arrived early this year. Flea prevention can be stopped once temperature is consistently below the freezing point which is very rare in Florida.