If you are afraid to speak to the public, or even if you’re not, Toastmasters offers classes in public speaking that have proved very helpful to many animal advocates I know. The classes can help you hone your vegan advocacy skills in the presence of nonvegans. Your classmates will listen to your message and help you make your arguments more effective. There are Toastmasters clubs in pretty much every city. I can’t recommend Toastmasters highly enough for improving your skills as an advocate and reaching more people at the same time. Local community colleges also offer public-speaking courses. Plus there are tons of great books available at any bookstore or library about how to be a more effective communicator.