If you work in the medical profession, you will discover many magazines looking for articles on all levels of the medical profession. Let's face it, most new writers are doing something to make a living other than writing. So find a magazine that is about what you are doing now. Find one that needs articles on subjects which interest you, or you can research or interview a professional in that field. Once you have found some magazines which spark your interest, you will need to write a good query letter and pitch the idea to the editors.
Most magazines require a query first, rather than the complete article.
This is a good thing for you, because you can actually pre-sell the work before spending hours writing something you love to write, only to discover that there is no market for it. Write a short, one page idea on a subject, how you plan to accomplish the work and any experts or professionals you will interview. Read the guidelines for that magazine and offer a story within the word count they need. Now, here is the key to getting that first sale. As soon as you get your first query letters in the mail, begin a new project idea for other magazines, query them and get those in the mail.