Hi-
I know you can find a list of tours on the Disney web site- just use 'tours' in the search box and all of them will come up.
Typically I think they book at the 90 day mark but I discovered that they are booking things like the 'Family Magic Tour' thru the end of the year which is well before 90 days.
Best bet is just to call the central reservation number and they can answer all your questions and you might be able to book right then.