How to pick a Market for Rentals

[Jackson Pontsler]

I read the "Long Distance Real Estate Investing" and will be completing my first flip in 2 months.  With the profits I would want to reinvest in a rental in a more affordable market and all my research has lead me to the MidWest to South East.  The research has included the buy to rent ratios on zillow and has given me some cities to look into.  What more would you do to determine which market you would want to focus on to build your core 4 (lender, realtor, property manager, general contractor)?