@David M. I would suggest the following if you want to do direct mailing.
1.-Select an area to market.
2.-Drive around the area if you can, get used to the neighborhood, understand what's going on in the area.
3.-Create your mailing list. You can use Listsource.com, rebogateway.com
4.-Target what you want to deal with (Pre-Foreclosures-Probate-Tax Delinquent-High Equity-Divorce) you have to know what you want to deal with in order to be more effective on getting the property under contract. Understand your seller so you can help them out by buying or selling their property.
5.-Create a marketing Campaign that you are going to run consistently (Minimum 6 Months) Change the message every month. (Yellow Letters are my favorite, post cards, fb adds, google ppc)
6.-Answer the phone when it rings, this is key.
7.-Establish a follow up system. The money is in the follow up!!!!!
8.-Visit properties, establish rapport and make offers. Find a way to help the seller, adding value will get you properties.
I hope this helps, good luck and happy investing!!!!!