Quote from @Delton Friedman: Hi Everyone, I have been looking at building a duplex to rent in the Houston area, but I am not sure how to start. 

You will learn on it.  

A great place to learn and research.

I would suggest making sure you don’t have any delinquent utility accounts or back rent.

Have you checked the subflooring for the kitchen floor in the lower level to make sure it is level and flat?

They have come to me about buying the home but I have a collection account about to fall off my credit in a few months so I am not sure I would qualify (in addition to my income may not be high enough).Are there any workarounds to maybe purchasing the home?

Be sure to save every text or other communication with him and the remediation was done properly (and whatever caused it has been taken care of as well).

I am doing much better in the properties where I have no pm, and the process is almost automated, using baselane to collect rent, good tenants, and few serviceman.If the tenants is not good, pms won't help either, not sure why I kept pms in the first place.

Not sure how to proceed with rentals in this situation.

Sorry what are comps I'm no expert but from what I've learned, comps are the prices other properties in your area have gone for.