You should do a DTI calculation so you know exactly how much you can allot to your housing payment.

I only see calculators and options to apply for loans.

To me the Opex is low even with my calculations I’m at 30-40% using poh rent numbers.

Understand the fees involved and calculate the total cost for an entire year of management so you can compare the different managers.

Probably like any market, look where the new construction is happening.Look at what people are buying and what they are willing to pay.See if you can do it better, faster, cheaper and still make money.Then calculate the max you can pay for lots.Then go find lots to build on.I'd probably draw a big circle around DFW and buy on that circle or just outside of it. 

While revenue at 10% of total property cost might be a quick calculation to find profitable properties, there are other calculators that will provide better insights for you.

Lenders don’t like half finished projects, especially where the borrower “mis calculated” by $100,000.   

One of the best tools out there is a blended rate calculator that can help you determine if HELOC or cashout makes more sense. 

They didn't have all the real estate books, blogs, YouTube gurus, financial calculators, etc.The best thing you can do is buy a house and educate yourself on how to manage it well.

What are good strategies or online calculators to help make rehab estimates?