How do I acquire probate leads?

[Stephen Kiser]

I noticed a lot of open and closed probate files at the courthouse today while researching a single property. What would be the best way to obtain these leads? Which ones are better to go after, open or closed? I am fresh in the probate world but I feel like the amount of effort to obtain these leads should keep most of the competition away. Could be wrong but just a thought. Would love to hear from someone experienced in this niche.