This handy item can be obtained by filling out an application at certain post offices. Call the different locations nearest to you to find out if they are an authorized location. You should check with local consulates to find out if a visa is required for entry, study or if your stay is over a certain amount of time. It is also a good idea to convert some US dollars into the currency of the country you will be visiting.
Credit cards are useful, especially for emergencies.
Shop around to get the best deal. The International Student Identification Card is the only student ID that is recognized in other countries. It is very valuable. These railroad passes offer a great deal of flexibility and is a wonderful way to see Europe. Handouts are available that describe the passes in more detail.