You can start here: http://www.avvo.com/topics/67-startups/sections/1555-trademarks
I did a quick search on Trademark basics in Avvo and found dozens of helpful guides. Here is part 1 of a thorough 4-part guide. http://www.avvo.com/legal-guides/ugc/trademark-basics-part-1-selecting-a-trademark?ref=kb_serp_title_9
With just a little search on Avvo you can learn a lot - for free.
While there is nothing wrong with an individual representing themselves or doing legal work for themselves, an individual who is not licensed to practice law in Texas cannot perform legal work for another person or an incorporated entity. Neither you nor any other employee of that incorporated radio station can register a trademark either in Texas or federally. You cannot "advise" or inform anyone how to do it. All of that is practicing law without a license in Texas. It is a crime. An lawyer experienced in Texas trademark registrations would probably charge between $500 and $1000 to perform the registration. However, I am not saying that you can register the name of a music festival as a trademark (actually this would be a service mark). It depends.
DISCLAIMER: This is not specific legal advice and does not establish an attorney/client relationship.
The internet is perfect for this kind of research. One site to check out is the US Patent and Trademark Office, which has lots of information about trademarks. Good luck.