What to plant is open to what you want whether its clover, chicory, etc., maybe do a google search for the 'whitetail institute' and look to see what they advise for plots in florida in the fall.
Most people don't plant fall plots until August up north or even into late Sept - early October the further south in the U.S. you go, so it is coming up and growing well when summer heat is just about to break.
One of our Admins has made a sticky post with lots of great info about plots in southern U.S. states -
http://www.deerhuntingchat.com/viewtopic.php?t=5587
Other than that just do a lot of reading of the other threads in the plot section, we have answered so many questions just like yours you will very likely find things that fit your situation.