@Jimmy Lieu, thank you for the offer.

The only real advantage to using an FHA loan is to offer only 3.5% down payment, which in my opinion is barely justified as an advantage. 

You are not allowed to compound interest.If you bought the certificate from the state on a best price offer, you charge interest on your purchase price, not on the full amount of the taxes that were due, but were not paid by you when you purchased.After you obtained your tax deed, you are entitled to something called "mesne profits" if you file an ejectment lawsuit against the former owner and they redeem during that lawsuit.  

It was just an offer (costs extra) through a local lender I used!

Holding the new property until passing offers a step-up in basis, eliminating deferred taxes for heirs.

When you mentioned you did your homework on the turnkey property, if that were the case you would have had a really good idea what the property was worth before you offered on it (of course sparing the occasional rogue appraiser, which may be what happened to you... idk) and certainly before the appraisal.

IMO what will make your company successful is the value you offer to your owners/clients & your tenants.

Regarding getting started, I recommend finding an STR owner who's overwhelmed or just worn out with managing their property, and perhaps who's also not using a dynamic pricing tool, and then offering to manage it for a very small cost. 

You will find that lenders will reach out to you and try to ally alongside you (I know I have received a few emails and phone calls from different lenders trying to offer their services) but few are willing to 'teach' you.

Have heard some PMC's allegedly offer other agents a ridiculously small amount like $200.