Years ago I was a bond trader at the Chicago Board of Trade. People would often tell me they were going to open a trading account and start day trading to make some extra money, so they would ask for some advise. My answer was always the same. I would ask them how much seed capital they had, then once they told me, I would ask them to cut me a check for half that amount and call it a victory, because they would lose it all.
While I won't ask you for a check in this case, I will tell you the best way to cover your ***..ets is to pass on this deal. In my experience, most flippers usually need the money in a rather quick time frame. Last thing you really want to do is learn on the fly with a time crunch, you are bound to miss something.
Take the advice in this thread and use it for another great opportunity, it will present itself again. Take the time to create a program, speak with some attorneys, or partner with another lender who has experience.
If you decide to move forward please consider the following in addition to your paperwork: title insurance; hazard insurance; rehab estimates; rehab escrows and draw schedules; loan servicing; surveys; appraisals; inspections; lien waivers; releases