Couple of pointers.

DAB and MCO......you have Delta and Airtran
MLB......only DL

You can buy a monthly parking permit at MCO for $36. All you have to do is show your crew ID.

DAB is same process, except I forgot how much it is. (Btw, I believe is cheaper than MCO).

All rental car companies in FL can rent you a car at one location and drop it at another (within FL only) at no charge. I used Alamo, National, Dollar primarily. Rates can go anywhere from $20 and up (plus taxes). It is a great way to -lets's say- leave out of MLB but return to DAB/MCO, and you have 24 hours to return it. Program their numbers in your phone, believe me you'll use them. The drive from MLB to either DBA or MCO is a breeze. Should not be more than 1:10 without having to speed. If you're moving to the inlet, then another 5-10 min.

Hope this helps and I think of something else, I'll post it. Welcome to La Florida!.