How do forfeited land sales work?

We got a letter from the County Auditor stating that the lot right next door to our house (undeveloped and not big enough to build seperate house on, but big enough for us to build onto ours) is up for auction. It also says: "Prospective buyers are responsible for inspection of all public records, including all liens recorded with the County Recorder, regarding the property for which they intend to bid." Now I did check public records and the guy who owned it has 3 different liens but the records don't state exactly which property they are for. I'm guessing one of them has to be for this land. If we bid, and won, what are we responsible for regarding this guys liens? Also what is the process for bidding on forfeited land? Any help on this os greatly appreciated. Also please forgive me for being an idiot when it comes this stuff but we've never had to do anything like this before and would really really love to have this land.