If you buy regular keyed locks (non-electronic) as Nathan Gesner recommended, then buy Schlage because they have a lifetime warranty on mechanical and finish. 

If you have, you have put yourself at great personal risk.Again, I recommend you get a lawyer as soon as possible.

Did you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?

Aside from downpayment, you want to have a solid emergency fund in place, something that can cover unexpected repairs, vacancies, or any other random costs that pop up.I’d also recommend saving more than you think you'll need and keeping a close eye on your expenses.

I recommend browsing Airbnb in your target zip codes to see what’s trending on the front page—this can give you valuable insights into what’s working well.

If anyone needs a private lender I recommend Andrew and his company; easy to work with, quick closing, flexible terms.

I’d appreciate any insights, lessons learned, or recommendations from those who have gone through this process.

From my experience working with over 400 investors, I’d recommend starting with house hacking—ideally a fourplex if you find a good deal, but a duplex works too.

What I would like to are some reading recommendations for learning the meat and potatoes on the processes of completing rehabs, and the processes of working with contractors?

Any recommendations on the most efficient way to track your time when classified as a real estate professional?