I am interested and I do have some questions. 

24 characters: collect 5 collars
32 characters: collect 7 collars
 
^ Are these goals for this amount of characters. Say that if a group of 24 characters collect 5 collars then something eventful will happen?

Will the characters know all about these collars at the start of the r.p.?

There will be subplots and/or other things to do on this island right?