Kyle, sounds like your well prepared to jump in and get the rehab done. If you are new to the site they have two calculators. One for BRRR and one for flips. I would definitely plug the numbers in to one or both of those and just make sure you like what you see and don't have any cost jump in that you didn't think of.
As far as paying yourself, I wouldn't make it too complicated. I'm guessing the renovation estimates account for professionals taking care of the work. If can get those lower by doing some of the work, by all means put some more in your pockets. But if you did refi back out and hold, you would be better off because you wouldn't be paying taxes on all the profit. Then if you did decide to sell after a year you would pay less in long term capital gains.
Those rents are a pretty wide range and you would have to know what you could get for your property specific, but $1,100 on a $100,000 house isn't bad. You shouldn't have any trouble cash flowing on that with a $70,000 mortgage @30 yrs.
Hope it helps a little. I would definitely pull the trigger, if nothing else just for the experience.
Neal