You'd better learn more about geography before think about starting your journey because the European railway companies have divided the continent into eight interrail-zones which you can take as a whole or combine them.
Picture taken from DB AG http://www.bahn.de/pverkehr/incoming/images/interrail.gif
| A | Great Britain, Northern Ireland, Republic of Ireland |
| B | Sweden, Norway, Finland |
| C | Denmark, Germany, Switzerland, Austria |
| D | Poland, Czech Republic, Slovakia, Hungary, Croatia |
| E | France, Belgium, Netherlands, Luxembourg |
| F | Spain, Portugal, Morocco |
| G | Italy, Slovenia, Greece, Turkey - ferry boats from Brindisi to Patras |
| H | Bulgaria, Yugoslavia, Macedonia, Romania |