Hi Georgina,
Keep in mind that if you bought a probate list that you probably will be competing with folks in your area that bought the same list. Don't go into this thinking that you are the exclusive, unless you hired independent researcher to source the data for you.
Let's assume you have a decent list. Next you need to market it. Getting folks to open what they consider junk mail is hard to do. So, what makes folks open their mail?
1, Handwritten envelopes, preferably with a handwritten letter. Don't forget to put an actual stamp on it. I know... time consuming. I have a client that uses a company that utilizes robots, holding an actual pen, that hand writes your envelopes and letter. Not as expensive as you might think.
2. Send it Federal Express. But, only if you have a list tailored to your specific game plan backed up with accurate and very fresh data. More expensive, but it definitely will not be considered as "junk mail" by the potentially motivated seller.
Good Luck!