Hi, it’s very good that you want to try for freelance copywriting. Now days the market for copywriters is vast and is expanding all the time, thanks mainly to the Internet where company information and marketing has to be up-to-date as soon as news breaks or a new product line is released. I know an online resource called Life on Avenue Z where you can get started easily. You can create you own blogs and it will be looked out by thousands of people who have already good skills of a freelance copywriter. Hope this will help you.
Best of luck!