After you receive your passport be sure to sign it and fill in the personal notification data page. Your previous passport will be returned to you with your new passport. If your passport is lost or stolen, report the loss immediately to the nearest embassy or consulate and to local police. If you can provide a photocopy to the consular officer it will help in issuance of a new passport. Your passport is a valuable document and should be carefully safeguarded.
Some countries require visas.
A visa is an endorsement made in and on a passport allowing entry into the country you're visiting, testifying that your passport was examined and found in order. Apply directly to the embassies or consulates of the country you plan to visit. Passport agencies cannot help you obtain visas. You can obtain a copy of Foreign Visa Requirements from the Consumer Information Center, Dept. 438T, Pueblo, CO 81009. It lists the entry requirements for U.S. citizens traveling to most foreign countries and where to apply for visas and tourist cards.