Becoming financially free with rental properties can be achieved through a combination of smart investments, savvy financial management, and a long-term strategy. Some key steps to consider include:

1. Researching and identifying profitable markets for rental properties, where demand is high and vacancy rates are low.
2. Investing in properties that are in good condition, with a positive cash flow and the potential for appreciation.
3. Managing your properties effectively, by finding reliable tenants, setting fair rent prices, and maintaining the properties to keep them in good condition.
4. Building a diverse portfolio of properties, so that you are not overly reliant on any one property or market.
5. Being strategic with your finances, by using leverage, such as mortgages, to purchase additional properties, and by reinvesting profits back into your rental properties to grow your portfolio.
6. Being patient, as building a successful rental property portfolio takes time, and it may take several years before you see significant returns on your investment.
7. Continuously educate yourself on real estate market, laws and trends to make better decision and improve your returns.

It is also important to consult with professionals in the field such as financial advisor, accountant, lawyer and property manager to help make informed decisions.