Building a direct mail list

[Akialah Ansar]

I just posted another forum about Direct Mail but this topic is slightly different. My question now is, what's the smallest my list should be? I'm still in the process of picking my "farm area" so last night I typed in two cities near me on List Source just to see how many addresses would be on the list. I am specifically looking for owner occupied pre-foreclosures since I would like to do a subject to deal, and a little over 300 addresses were on the list. Is that a good amount? Should I be looking for more? Is that a good place to start? I'm completely new to real estate and the direct mail marketing method so any advice is appreciated! Thanks in advance! Akialah