I am assuming that you are a high school graduate and now in college and looking for a part time job. First of all it is important to write down some of the classes that you took if they apply to the job description. (for instance, if you took a business office class and are applying for a part time office job that would be very important. Any class in which the subject matter would be beneficial to the company you are applying to is important for them to know. Also your grade point and the grades that you achieved in these classes are also important for the employer to know.
Another point that would be important for the employer is to know what kind of activities and clubs did you belong to. If you held an office in these clubs you note that on your resume. Example: Vice President and then list the work you performed for that particular office. Don't forget to put down the dates you held the office and how long you this position.
The third point would be to have a section on your resume that highlight you skills and qualifications for the job your are applying to. A little secret would be to look at the job description and see if you have any of the skills that they are looking for even if you did this job as a volunteer.
That leads me to the fourth point which is volunteer jobs that you might have done will finishing school. If you babysat, mowed lawns, took care of animals when the owners were not there, tutored other classmates or anything else that was a volunteer job you would have a section on your resume for volunteer work, explaining the work you did and the dates that you did these job.
If you are a High School Grad always put your graduation date down, name of school, and any awards or achievements that you got during the time you were in school. Also, your GPA could help depending on the job your are applying for. "Remember you are selling yourself to this company and they should know all the wonderful things you have done."