"What we're probably going to do is sell each step individually for $2 per step, but also put together packages at a discounted rate."

You'll get some common requests like "All bronze steps" and for those releasing them on a CD-rom (do you have a CD maker? That is probably easiest) makes sense for a few $$ more.

"first level of Int'l Cha Cha, Samba, Rumba > and Jive on tape"

P.D. too?

"I'd like to be the first out there to have a complete reference of ballroom dance steps online."

I'm sure yours will be the first, best, and most complete.

As an information visualization expert, let me know if you need any help with diagrams, graphic presentation of preceed/following, etc. Normally I bill $85/hr but for this project I could do pro bono if it relates to my dissertation research (which it probably would)