Duplex / Triplex / Quadplex

[Nathaniel Jee Hoon Weber]

My partner and I want to start investing in multi-family homes. We were looking to buy and sell, and possibly rent them out. He seems to be very confident in knowing how to close deals with them. I'm just not as experienced due to me being new to real estate investing. He mentioned looking in York, Pa and Hanover, Pa. How do i find out if the market there is good and going to grow in the future?