just do a regular resume, obviously with your objective being that you're looking to work in retail.
after that, probaly do a cover letter, which should be directed towards the person who does the hiring (call around and get a name). in the letter simply explain why you're right for the job and at the end, always say something like, "i look foward to hearing from you." after you close the letter, throw in your phone number and email address again, just so its easier for them to get ahold of you (it should already be on your resume, but still).
i applied for a job and got an interview last week, and it was AWFUL. the position was for a personal assistant/assistant buyer (that's what the ad said) and the woman i had emailed my resume/cover letter to (the woman who would be my boss) was not even THERE! instead, some hokey sales girl interviewed me and basically the job was going to be to be over the sales girls, while attempting to keep this woman's schedule on track with vendors, clients, etc. the girl interviewing me was SO unprofessional, it made me want to barf. the woman is supposed to get back into town late this week and call me. whatevz. i really have no desire to work with them.