Too often, I just hear people say they are "looking for a good deal", but defining that good deal in a specific area makes it much easier to spot. 

Assumptions: specifically allowed in city ordinances, mobile home manufacturing in the area, or that someone heavily marketed that area as a retirement location in the past. 

I will preface this with the fact that I have a legal background, specifically with estate planning and asset protection.

.)- Crime stats... if you know specific zip codes/submarkets that you'd like to target, the best data will come from local precincts. - and more..I'd recommend remaining active not only here on BiggerPockets, but in other valuable RE investment networks that you can find - i.e. local meetups (meetup.com, eventbrite, BP local events). 

I've specifically learned a lot from Dave and Henry on their podcast, but also appreciate Jesse Vasquez' approach with her mid-term rental investments.

Income will depend on your plan for the specific asset. # of units doesn't necessarily equate to how much income you could make.

Focus on tenant screening, building a local team, and learning as much as you can, starting early sets you up for long-term success!

There are a lot of good meetups for real estate investors in the area that would be good to grow your network and learn from others that are and have been in your shoes as a new investor, message me and I can share on some specific monthly meetups.Also sharing some multifamily data, this is Boston proper so it has an interesting trend compared to the rest of Massachusetts.

If you have specific questions about property management, I'll be happy to help!

That said, I highly recommend speaking with a local professional in the DFW area to get insights tailored to your specific goals.