In order to get discounts at Disney you must hold an IATA card or be on an agency's IATA list. In order to get the card once you're on a list, you need to follow these rules...
1. the applicant must be working for either an IATA Accredited Agency location or as a qualified agent working for a non-IATA
travel agency which holds a code issued by IATA for TIDS, SSI or NISI.
2. agents must have been working in the travel industry at least six months without interruption prior to their application
3. they must have earned at least $10,000 in the 12-month period preceding the application (this amount may be prorated for those working at least six but not 12 months); and
4. must currently work an average of 20 hours per week on an annual basis in a travel agency, in a remunerated position involved in the administration and/or sale of travel.
So, its not easy, and as others have said, isn't a magical card that will save you thousands of dollars. I use mine occasionally, appreciate the discounts I get, but definitely don't count on it anymore. I'm home-based, so I can appreciate your desire to sell Disney and other products in your spare time, but understand that one course (or ANY course for that matter) is not going to cut it. There is a lot to learn, and a lot that you will become liable and responsible for and after more than 8 years, a lot that I still don't understand!
There's E&O insurance to consider at at least $350/year to protect yourself from lawsuites, for one. You get one unhappy bride or one flopped vacation and it is you that the travelers are going to blame. I don't want to rain on your parade, but I just want to make sure you understand the scope of things. If you are willing, then GO FOR IT! I LOVE my business, love working from home, love traveling and love selling travel to others. It is the best thing I've done. Its a lot of work, but the rewards are great! BEST of luck with your decision! Email if you have questions...shelli@shellistravel.com.