Get a job or go to college and whilst your there start making your own sites in your spare time. Make a couple of sites in a subject your interested in or a cool niche idea and use your co workers or lecturers etc to help you learn to develop them.

Sign up for adsense when you have a site finished and that will give you motivation to learn seo..

To work for yourself your better off having all round experience and a good few years of it.