@Jon D. some questions, the answers may help you better focus.1) Why did you pay your primary mortgage off in the first place?

They will also save you a lot of time by handling the transaction details so you can focus your time on however you make money or your family or hobbies. 

I have always dealt with small and medium towns and focused on 1000 homes or less.  

Focus on understanding the rental market, conducting thorough property inspections, and leveraging owner-occupied financing options like FHA loans.

I want to become really good at analyzing deals, and determine the markets I should focus on.Are there any resources aside from this forum (books, journals, news publications, podcasts) that you recommend I use to learn more?

Is there anything specific I should focus on during the due diligence process, particularly regarding title and document inspection, compared to a traditional sale?

Focus on getting your finances in order, setting achievable goals, and finding a mentor or local real estate groups to guide you.

I would focus on OKC for the best bang for your buck.

The key to purchasing more real estate is by focusing on the fundamentals of the real estate.

Since you're not rushing for a quick flip, you can focus on quality construction, tenant-friendly designs, and strong rental markets that yield solid cash flow and appreciation over time.A few things to consider: Location is key.