Default RSS feeds for SharePoint lists are not enabled – you will need to enable it per site collection. On the RSS settings page you will also be able to add some additional info to include into the feed such as copyright statement, managing editor, webmaster as well as the time to live (in minutes).
Next you need to define on a per list basis whether you will allow RSS feeds. It is also in this screen that you can define whether you want to include additional fields/columns in the RSS feed. Be careful though, when you add additional columns outside of the standard fields in RSS (title and link), these will be exposed in formatted HTM and not XML which will make it difficult to parse.