I have joined a mastermind group which I know will help multiply my efforts.

Multiply those types of returns by 10 or 20 houses and there's very little that comes close to the kind of returns you're going to get for such small amounts of investment.

The FHA house needs to pay for itself as if the property was fully rented out, even though the buyer will be living in one of the units.This is an FHA guideline stating that 3-4 unit properties - must have market rents added up together multiplied by 0.75 that are greater than the monthly mortgage including taxes and insurance. 

Multiplied over a few properties and it starts to add up.There are quite a few limitations, especially once you make over $100k per year the deductions start to get phased out.  

And they multiply that by trying to scale rapidly thinking riches are in sight and the coming apocalypse in many parts of the country where regulation changes and rapidly increasing competition from other Airbnb wannabes or hotel chains, and other things that will grind down occupancy and rental rates.

You can find your ballpark purchase price by taking what money you have to invest and multiplying by four.

Multifamily and commercial loans are not 30 or 40 years they are often due in five years and you keep re-qualifying and refinancing." so I need to multiply the cash flows yearly by 5 years and check if it is the same price as the property?

Multiply and expand.Look at each asset as a business.

You know that leveraging (without going to 80%+) somewhat will multiply what you can do.

If I have to negotiate labor cost with someone whom I have never worked before and that person couldn't give me a labor price up front, I would say: "To me, this seems to be a X day job (feel free to use half day), (in your mind, calculate the hour x hourly rate = Y dollar amount, make sure it's man-hour or man-day so if it's a two-person job then you need to multiply by two for the same time period) does $Y work for you?"