Yep there is a little sign that you will check in and give them your confirmation number. I would show up earlier then you need so you can get some great pics infront of the Castle and the tree of life!
I just booked a few days ago and was asking on the Dis if the 8:35am or a 9:55am for Donald's Safari Breakfast was better.
Yes, there should be a photopass photographer around. When we walked up Main Street last year, I couldn't find one then all of a sudden they all started coming out.
I will be getting into both parks early in October. I managed to get an 8:05am for TH and CP.