To write an effective profile, you will need to learn as much about your subject as possible. Your subject can give you good background information that leads to further information. If your subject has a resume, ask to see it. Friends and people who work with your subject, can also provide interesting information. Take good notes, or tape-record the interview, so that you can use plenty of direct quotes in your writing.
Profiles commonly introduce the subject through descriptions of how the person looks and acts.
If convenient, and if your subject gives permission, visit the person's hang-out, dorm room, office, or watch them play soccer. . . Do your best to record details that tell the most about your subject's special interests. Settings can be described on their own or can be subtly worked into the piece. Take your subject's comments into account as much as you can, but maintain ownership of your interpretations and characterization. In other words, there should be a nice balance between your interpretation of your subject and the way the subject portrays herself.