Good question, Glasis. The best way to begin a career in fashion is to study the latest trends through fashion magazines, runway shows and other fashion photography.
Also, many trade schools geared toward arts education offer concentrations for fashion design and marketing.
Getting an internship or job shadowing experience with a designer, buyer or modeling agency can also be a big help. Like most high profile jobs, who you know in the fashion industry may be just as important as what you know.