.- I sold my home on 1 lot and kept the vacant lot to sell individually.

Any broker or individual investor who values a non-commercial asset using commercial metrics are only showing their ineptitude. 

To be successful with this, I want to focus on working with one individual/company at a time.

AKA the actual rate of return on a property you are feeding will generally be poor and you would be better off with a better cash flowing rental or in the stock market.Of course, if you found a great appreciating market or structured the debt to be shorter term, feeding a rental could work out well.

At a minimum, you need to verify their identity and their criminal record.I generally combine their income to meet my standard of 3x the rent but if there are three or more unrelated people renting together than I require each individual to make a minimum 2x the rent.

Here are some of my favorites that helped me to get started:Rich Dad Poor Dad - Robert KiyosakiLong Distance Real Estate Investing - David GreeneThe Book on Investing in RE with No (and Low!)

Start by telling us what part of Texas you need this individual to work in.

The reality is that opendoor, zillow, etc are making some pretty poor purchase decisions, that a seasoned trustee sale investor wouldn't.

Basically Anywhere that offers poor cash flow is going to be a hot market

Or leave them under their each individual mortgage?