A resume for a Radio Jockey position is not dissimilar from a normal resume. You still need your basic details, as well as to display an enthusiasm for the radio. They won't want to hire somebody who doesn't look like they aren't committed though. You need to indicate your education and work experience. The latter is most important. Just applying for a position on a whim isn't going to cut it; you need to display some previous pursuit, either of learning the technology involved within radio, or public speaking, or being a DJ or in a band. You need something there to validate your reasons for wanting to pursue a career in this.
A good layout for a resume would be to open up with your basic details and contact information, before selling yourself in the first paragraph or two of the document. You then want to detail your work experiences and education before mentioning anything else relevant and your personal interests (to confirm you're well rounded). Then conclude with a few good references and you're set. Some applications will also demand a cover letter. Like the initial pitch selling yourself, you need to focus on this position. Knowledge of the job role and their company will help immeasurably, as will really emphasising your abilities and your worth.