Those are the basics, yes. But remember that cash flow is dependent on a number of things - in particular your monthly expenses. For starters you need a good idea what the PITI is going to be.
These are pretty much fixed, and you can get a solid idea of what the prices are by shopping around for an insurance policy yourself.
I'm a big believer that the more information you have, and the more prepared you are, the better positioned you are to make the sale.
There's a big difference between marketing a house saying: ARV 250K Ask 35K and saying: ARV 250K Rehab: Roof, Kitchen, Exterior,etc. (with prices for each) Comparables, and rents in the area.
You want to break it down for them so that their due diligence doesnt require a lot of footwork. They may do everything over again, but if they see your numbers are exactly their numbers, they're going to work with you.