I have a bachelor degree in advertising, but a portfolio school is a usually two year program that helps you create a portfoilio that will get you a job. I attend Miami Ad School (Minneapolis location, they have locations all over the world), there is also Chicago Portfolio School, VCU Adcenter(Richmond), and Creative Circus (Atlanta). It is a lot of commitment, but a portfolio is all you need to get a job as a copywriter. They don't really care about degrees. At my school there are people of all ages, many who came from very different fields of work. A portfolio school isn't absolutely necessary to become a copywriter, but is necessary to get into the bigger and better agencies. You can always make a portfolio of your own by making 5 or so campaigns for clients. If you are interested, you should read a book called "Hey Whipple Squeeze This". It should help you with your portfolio.