Contractors

I filed a mechanics lien on a house that I had built a room addition on the property for the owner. I had an oral agreement that I would be compensated for my labor at the time of her selling the property. Now she has sent me notice to file suit to collect on the lien. The lien is for $23,000.00. Is it to big for a small claims court?

We are a subcontractor on a Tennessee project. Do we need to submit a pre construction lien notice before actually starting to work?

Where do I file a mechanic's lien?