Rookie looking to start a direct mail campaign - HELP

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Hi all -
I am looking to expand my portfolio of properties (currently own two multi-family rentals) and want to purchase and fixer. I’ve had my eye on a couple “up and coming” neighborhoods where I would love to invest. A colleague of mine and fellow investor told me I need to stop looking on the ML and start a direct mail campaign to try to grab something off the market. I like the sounds of a direct mail campaign but have no idea how to execute an effective mail campaign. Where do I start? What does my message say? Do I have the mail piece professionally put together or do I simply type up a letter to send out? Where do I go to get owner names and addresses? Any advice is greatly appreciated! Thank you in advance for your time.