You just have to have a passport. There are no age requirements.
No, you only need a passport when yo go to a different country.
You need a passport to go anywhere out of the country!
The passport that you obtained to enter the country is the same one that you need to exit the country.
You can fly anywhere within the borders of your current country.
Probably not.
no but to go out of the country you do yes you do now
You shouldn't have left your country without a passport, but: Your best bet is to go to your country's embassy or consulate and ask them for help.
Yes, you do. Anytime you go into another country, you need a passport.
Getting a passport is very simple. This site gives all the places to go to get a passport. I had to get a passport a month ago before I went to Mexico. I went to this site for information help.
You always need a passport to enter another country
None - you need a passport. A Green Card is not a substitute for a passport.