Can someone talk "Tax Delinquent Real Estate Auction" to me?

[Laurie Falk]

There are some tax delinquent real estate auctions going on nearby within the next week or two and I'm curious how they work. There's a list of the properties that are going to be auctioned, some are land and some are SFRs. Do these have a reserve the same way someting online would? What kind of % to market value are they looking for? What questions am I missing? 

Is there a good podcast that covers these? I'm trying to listen to them all but I'm not very far and it's a lot of info!