>>1 Wish you could share what you've got so far.
Honestly, since you're a teen, it doesn't matter where, if you've had ANY work experience it needs to all be in your resume. Also, if you have recommendations, that's a huge plus. Some people include photo in their resume, but if you feel like discrimination could play a factor, then don't put one; your choice. Including your high school GPA would be good too under the Education section within your resume. If it's a good GPA, it shows you do your work efficiently and consistently and would make a reliable asset to the company.
In your resume also add in some qualifications; a quick summary of why you should be hired. It's a bit different from a cover letter (which I hope you have one) which is like a summary of your entire resume.