Most professional writing classes would cover this in college but since your probably not in college because you are 15 i will give you some tips.
Sections to consider are:

Your heading should contain the following:
Name
Address
phone number
email address

Career Objevtive:
A short description of what you would like to accomplish.

Experience:
List any previous jobs you may have had in this particular field. You can also list non paying jobs or work study. An example would be a computer lab assistant at your highschool.

Skills:
List all skills you have learned in list format. Any software suites etc..

References:
List work and personal references here along with there phone number and relationship.

A few more tips that may help are as follows.
Use resume paper that is not wite. Usually a soft yellow is sufficient to help your resume stand out amoungst the many. Although in your case it may not apply because you are most likely the only one being evaluated.

When creating your lists use bullet points. Also make sure to employ paralelism.
Paralelism means to use the same type of verb, noun, or adjective to start each short phrase.
example
Using
Building
Deploying
Serviceing

Heading should be bold and in a slightly larger font and if you wish you can write a cover letter to include with your resume. I have including a link here that may help you along also.
http://owl.english.purdue.edu/handouts/pw/
I hope this will help you and good luck in getting that job.
Ease