Evicting in Memphis, TN Help!

[Stacy McGee]

I bought a duplex a month ago and inherited a tenant on each side. One tenant has paid the rent on time but one tenant is missing in action, unresponsive to phone calls and won't pay. Today is the 7th and still no sign of said tenant. What is the first step I need to take to stand firm on receiving payment? I don't want to handle the first occurrence ineffectively and overall send the wrong message. I am new to being a landlord and want to familiarize myself with TN laws. What sites should I read up on? Should I immediately get an attorney? What steps should I take at this point to ensure I am going about this the right way. Any and all help is appreciated.