Then cash out refinance out put new debt on it .

Tied to an SEC shelf registration where the issuing firm says they will issue debt over a period of time in the form of medium term notes.Depending on what role you want to play you may need to be licensed or otherwise regulated.MTNs are mostly for companies that want to borrow funds for projects, working capital, etc.

Where does everyone find taxes, vacancy rates, expenses, etc.

I have not read the book but I have done many sub 2's over the decades and for us it was just a standard purchase contract and when it says additional terms we just described that we were taking title subject to the existing debt or which debt would remain on title.

Not to mention agent fees, staging, and short-term gains tax from the sale.

You can use a co-borrower just make sure they have good credit and a (2) year work history of W2 income.Try and avoid self employed co-borrowers because their tax returns typically do not show income and are full of deductions.

Is it better to buy a primary house with 5% down and stay for 2 years after which I can rent out (hoping rents increase by then) if not I can sell it and be and be exempt from taxes on capital gains.2.

They could use the tax break for gifting into someone's 529 and I wouldn't claim the money that goes straight into the kids 529. 

If you have or buying a rental/airbnb or even fix and flip.  Do you want the property in business name/LLC etc?Also if you have a business for just buying/selling land only and spend money/milage traveling to properti...

Using a 1031 Exchange we were able to defer capital gains taxes and upgrade to the VRC.