You can learn more with these resources:
The Mr. Media Training blog offers daily tips on media relations and public speaking. It is available at no charge.
The Public Relations Society of America is a member organization sharing public relations professional development information, career counseling, etc. Some content is available at no charge.
Ragan Communications is a company offering communications, public relations, writing, social media and other guidance. Some content is available at no charge.
If you live near a community college or university with a journalism or communications curriculum, you may be able to take a writing or media relations class.