1. I would recommend a second table of tracks you would create a relationship between the Cd table and the track table. Filemaker can handle just about any kind of search you need.
2. Yes, you can have auto-number. In your relationship graph you can setup your portal to allow create of new record and your portal will have a blank line.
3. Yes, this will have to do with your relationship and portal.
You can do google search and search filemaker for more information.