If you are very young, the employer should understand. Babysitting, lawnmowing and carwashing also count. Be sure to include all of the skills you do have, including computer skills, any certification you have received, school honors, and so on. Have a list of references that would be easy to contact--be sure you asked the people first so that they are expecting the call. Fill out the application completely and neatly--this will also speak for itself.