In few words the rules are:
- The National Final will be held in February 2013
- Submissions are open from 3-16 September 2012
- Entrants may not take part in other countries’ national finals
- The top 12 will be published on 3 December 2012
- The lead singer and composer must be Finnish, or have a Finnish residency permit
You can read all the rules here, it’s in Finnish.