@Leonard Smith It depends on what marketing you will be doing. If you're buying lists and mailing yellow post cards, that can get pretty expensive. Here is what I recommend to save yourself a ton of money.
Buy 25 blank yellow bandit signs and 30" H-stakes. You can use Dirt cheap Signs out of Texas. 25 of them with stakes are $65+shipping. Hand write them with a big Sharpie something similar to the "WE BUY HOUSES" signs you've probably seen before. Put them out at major intersections in your area. Your phone will start ringing.......a LOT.
You could also do the same thing to find cash buyers, just with different writing on the signs geared towards cash buyers. You can put up a ghost ad on Craigslist to get cash buyers. Grab pics of a house for sale on Zillow or wherever from a different state than yours. Post it for sale on CL at a steal of a price. When cash buyers call, tell them it's been sold, but you always get new deals on a regular basis, and you can add them to your cash buyer's list. Find out what their buying criteria is, and start a cash buyers list and put them on it.
You can also have an agent pull up properties recently(3-6 months) sold and paid for with all cash. Then get the cash buyer's contact info, sign up at been verified or somewhere, and plug in the info you got on them and it will give you a phone number and email address. Call them up when you have a deal under contract, or call them up before you have one and find out what they like to buy and where, add them to your list. Hope this helps.