I too drove my own car down from Indiana. They will pay the mileage to get you back home but it is limited to their cost for a one-way ticket. (Wait until a couple of days before driving home so that the airfare is higher!) They paid me over $400 to drive home which more than covered the cost of gas both ways.
Training pay is $1600/mo, but while away from home you also get about $1700/mo in tax-free per diem ($57.60/day). If you stay at the Courtyard you get free breakfast buffets (which most turn into a large brunch!). If you stay (or sneak into) the Residence Inn next door they have free dinners Mon - Tues - Wed. It's possible to live on the cheap in MIA, which i'm sure many of you are also pro's at!
Good luck, and welcome!