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There's many teaching courses available on and offline, but as long as you understand the fundamentals and can make a sale with your writing skills then your more or less covered for any endevour you choose, because sales language is the same no matter what market you get into, its a framework model.
I've been writing copy for a while now, and if there's one thing I learned, it is that each project is different. Yes, the format may be the same - a press release is a press release, no matter who writes it. But since the business of each client is different, and your target audience is different, you need to think creatively about each project.
It's easy to teach yourself how to write good sales copy by going over and studying other copy, and understanding target audience and purpose. Fortunately, sales copy is everywhere. you become aware of this the more you delve into the subject and it's easy to see whats working and what isn't.
As a copywriter looking for good content to study, your best resource surprise it or not is your junk mail, check out some of the sites there, and pay attention to the ones that really grab your attention. When your reading magazines and Web sites, read all the ads very carefully- Try to figure out whether its working or not and the aim of the copy- is it asking you to sign up? or click on something? see if you feel compelled.
You get clients by approaching them and letting them know your good. Build up your portfolio of sample pieces of writing or case studies of other projects. You can write the sample ads, press releases, web content - any type of copy that would like to write for others.
your copyWriting skills grow with each customer, and before you know it, you'll be a competent self-taught writer - and you know that yes, you can sell products and work for yourself if you so desire.
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