how to find your first rental property

[William Plymouth]

Hello everyone.  I'm brand new to investing and live in the Philadelphia area.  I'm looking to buy my first property by the end of this year.  The type of property I am looking to acquire is a multi family unit (either a duplex, triplex, or a quadplex).  To be honest, I'm lost and a little over whelmed.  How did buying your first property go?  What qualities do you look for in a multi family unit?  How do you truly figure out your market?