One thing I would change is that all of the security deposits being held by landlords are sitting in savings accounts or escrow, earning meager interest if anything.

Similar to what you said I knew I needed cash reserves for our business but didn't want that money laying around in a checking account not earning any interest.For book keeping I recently transitioned from Google Sheets to Stessa. 

In fact, given the start up costs, the best way to make a profit as an MTR is to earn the continuing support of the property owner served.  

Even if you give $5k to earn $10k wouldn’t that be worth it?

Right now, focus on being the best salesperson ever and keep earning before you spend.

You certainly earned your freedom from your W2 job & in a relatively short timespan. 

Sports stars earn $10 million in five years, then wind up on skid row. 

🌞6️⃣ Rental Income Deductions: Earn income & deduct related expenses.7️⃣ Home Equity Loan Interest: Deduct interest if used to improve your home.8️⃣ Military Moving Expenses: Active-duty?

You can earn more by keeping your money invested in the market and letting your tenants pay off your mortgages. 

So, the real estate broker/agent would have to inform the seller of the fair market value of their home, making it much more difficult to earn a profit larger than what a real estate commission would be.