visit Tagxedo.com and you can learn there. Also Google for Tagxedo tips for additional help.
Most DISigners simply start by doing.... experimenting with techniques.
Many tutorials for various software found via web search. Do you have software? Quite a few of us use Photoshop Elements. Also clip art and other graphic details easily located via Google (or Bing) searches. Generally DISigners will not supply clip art that you can easily locate yourself.