If this is your first time out of the country, you will need to obtain a passport.

Passports can take several weeks to obtain so be sure to apply for one as soon as you are able.

You will need your birth certificate and a current photo. Many passport offices will take your picture for you (for a small additional fee).

There are a number of passport office locations including post offices and courthouses. See the site below for a list.

For more information see this site: Travel.State.Gov and Dominician Republic Country Information

When traveling you should make a photocopy of your passport and carry this with you at all times.