Um, you can't be serious. But, just in case you are, the place to start is the the Swiss Code of Civil Procedure and the Gerichtsorganisationsgesetz for the canton where you are filing. Information here:
http://www.zpo.ch/index.php?option=c...d=49&Itemid=41.
A contract dispute will usually be filed either in the court where the defendant is domiciled or habitually resident or in the courts for the place of performance of the obligation (Art. 31 Swiss civil procedure). Which court specifically depends on the kind of claim and especially on the amount in dispute. The claim must be filed in the official language of the court (Art. 129 SCP). This means German, French or Italian. Without full command of the official language of the court, you cannot file a claim and represent yourself.