Donation wish list

Amici,

I'd like to create an online donation list in a sort of dynamic form. I"d like to create it somewhat like a wedding gift registry site:
There is a whole list of objects needed by the organization, let's say Teddy Bear, Car, Lego... Then people start to register and choose one (or several) of these options. Now anytime someone ticks a checkbox of an in-kind donation (e.g. Teddy Bear) it should be hidden for the next person checking the form. So the next person could only select from the rest of the list.

How shall I start?

Thanks,
-greg