1) Do a search of these forums. Lots of good info is already here, and people with answers get tired and don't give as good an explanation when it's the nth time. Others just don't bother replying.
2) Talk to the FA people at the schools you want to attend. Things are very different depending on a lot of factors, and they will have the best idea of what people do in that particular post-bac.
3) One thing that matters is whether the program counts as graduate-level, or undergraduate. Is it a Master's, is it some type of grad-level certificate, is it a "5th-year undergrad," is it not really a program at all but a loosely-aligned sequence of courses? The answers to these questions drive everything else.
4) One thing that does NOT matter very much overall is your EFC. The EFC is just a number that the federal formula uses, to determine how much NEED-BASED aid can be part of your overall fin aid package. At the post-bac level, there's hardly ever any eligibility left for Pell Grants, and the expense of the programs usually means we'll get max Subsidized and Unsubsidized Stafford loans even with a higer EFC (I know I did).
5) Federal loans can go as high as $10500 in one FA year for undergrad. For grad, that goes up to $18500. The lifetime limit for undergrad is $46k and for grad it's $138.5k.
6) Seriously, talk to your FA person at any school you're seriously considering.