This is a couple in their mid-60's, working class, and solid blue collar folks (that is the neighborhood's reputation). 

Broad can be overwhelming...for the past 9 years, I focused on rehabbing SFR for rentals or rent to own, but  looking to explore other areas like resells, commercial, etc...RE is unlimited!

When first starting out, you'll need to explore different marketing methods to see what works best for you.

I am exploring a 7 unit property in Fayetteville NC The draw back is that all the units are one bedroom.

They're exploring options for new landlords such as requiring them to take the class within the first 6 months or year of being a landlord.Let me know if you have any questions about the class or if you are wondering if you need to take it!

I am looking for a good reputable CPA in the Houston area that has a background in real estate investing and is also an active investor.

In real estate, reputation is everything.  

I would explore refinancing with a goal of finding a low closing cost bank.  

I am still exploring the pros and cons of both SFRs vs duplex or tri.

Martin - You will have to get a Phase I anyway within the prescribed time as part of acquisition, so do that with a reputable company which should include the remediation results and NFA letter.