First of all...continue to build your running base. A solid base of 15-20 miles per week would be my suggestion, but you have to get there slowly so you remain healthy. No more than 10% increase per week. Once you have your base, work on cross training to add stamina, endurance and strength. Goofy is very serious business, even for experienced runners. Add the heat and humidity of Florida and it can be downright dangerous. Your main goal is to show up as strong and healthy as possible. At 20 weeks out you'll need to start a serious training regime to build up your long run miles safely and possibly add back-to-back long runs. But until then....train to train and think BASE.
Best of luck.