How do I get a pre-quall letter?

Found a lot that I want to make an offer on, its 65% below market. I am making an offer tomorrow morning through a realtor. How do I get a prequal letter, if I am wholesaling?

If your parents or yourself have enough cash in the bank to buy the lot, just send over their bank statement. or try to befriend a mtg officer and get one, or if your credit is Ok then get a real one, with the amount of different financing options out there I am sure there is a way to get one.

Do you already have buyers lined up for the deal?
what is your escape clause going to be on a lot deal?