Simulate a purchase, then once you start looking around you will get more accustomed to working leads and knowing if one will work for you.  

We use a home grown simulation package to model potential acquisition under varying future market conditions (most of them pessimistic) to see of the property will hold its own and provide acceptable returns in all likely scenarios.

Also asking if some one who has done this or simulator how do I calculate out what all it’ll cost I’m struggling to figure out if through the interest only payments, payback period, my current mortgage, and my new mortgage , what all I can expect to pay/if I can afford or even if this is a good idea.

They are doing this to simulate a cash out refi without the new lender knowing that that's what they are doing (can you say falsifying and misleading?).

I need to do more research and probably some simulation in order to make sure which one I prefer.

I confirmed my theory by simulating the scenario in Turbotax as well.

Ideally, I'd like to see cash flow here if I were buying these properties as a standard rental as simulated in these calculations. 

The book simulates one of Conti's Intensive 3-day seminars, which gets students on the phone talking to sellers on day 1 and looking at properties they set appointments for by day 3.

If you work with an agent you may want to run some pricing simulations of what if my roof was new what if my roof was 12 years old and see if you can get some ROI by doing it sooner than later. 

A few chapters reference the Trinity Study and Monte Carlo simulations and provide good insights.