Also go through a servicing company for payments to the seller, escrow can probably help you out with a recommendation for that. 

THE NUMBERS: With a purchase price of $7M, my Investors and I put down $2.7M as the down payment on the property.

Payments $492 (interest, tax, insurance) currently owe $51K.

Your payment requirement would rule you out for us. 

I forget; it was payment processing related) that required me to have a website for the business.

Don't accept ANY partial payments.

Here’s a chart showing what percentage of an American’s average mortgage payment goes to taxes and insurance:Rising taxes and insurance premiums make real estate even less affordable for buyers already facing higher home prices and mortgage rates that rose ~150% in less than two years.

That's $1680 per year for QBO, plus my Bookeeper at another $500 a month to log monthly statements, break down loan payments, and reconcile.

If you aren't paying cash and are doing owner occupancy you may be able to use FHA instead of Conventional with a higher down payment. 

Set clear goals, save for a down payment, and practice analyzing deals to build your confidence.