Personally I never listen to what the seller states the income is as they are sometimes way off.

Investors want a person that they consider a good "business partner", but most of the wholesalers I see come of as borderline crimnals.

This is my first personal mortgage so I'm trying to learn the game.

I know i personally wont build anything with adjoining walls as the long term liability is to much risk for me.

It depends on where you want to live, income, personality, and other factors.You could buy a large home and rent out the individual rooms to cover expenses, but this comes with problems.

If you've never done it and never looked at properties anywhere in person, how will you know what any of the numbers even mean? 

Without any form of credible references this person may care less about you and are only interested in the sale, which would be your problem after.

Explore my personal favorites, Set For Life by Scott Trench or The Total Money Makeover by Dave Ramsey, for invaluable financial insights.3.

I would personally roll the dice on the rental and see where it gets me if you don't have to sell at this moment. 

What I've seen is that when asked to provide an assurance that a loan wouldn't be called because of a due on sale clause being triggered, the lender customer service typically just outright says it's not allowed, or default to a "no", because they see it as a black and white question, and miss why the due on sale clause is actually written into the mortgage document to begin with.If one is transferring property title from personal name, a Grant/Warranty Deed would be drafted/recorded to transfer title.