Hey @Rick Magennis I would recommend building your Buyer's List first. It definitely helps to know what you're looking for and there's nothing worse than having gone through all the motions and getting a deal under contract at a good price and then not being able to sell it and get paid. You don't actually have to have mailed a cash buyer's list in order to know where to do your marketing to find deals. If you're looking to wholesale your deals, you can ask an agent to find out where all the cash transactions are taking place at.
Another option is to go to a foreclosure auction and find cash buyers there. This is a piece of advice Sean Terry (one of the wholesaling gurus) recommended and that I implemented in my business. Foreclosure Auction buyers have to be cash buyers, you know they can make a decision fast and they will generally be willing to tell you exactly what they are looking for.
A third option for finding cash buyers or where to do your deals is search for other investors in your local area and see where the deals are being done. You can check out sites like MyHouseDeals.com or look on craigslist for the "Cash Only" deals to see what's there.
A fourth option is to ask the other local and active wholesalers "where are the deals being done?" They will generally know and be able to tell you the zip codes and neighborhoods to target your marketing to.
All that being said, I tend to prefer to look at the actual cash sales data in the MLS or tax records versus going off of what people tell me. I hope it helps!