Here is the link to the BG page. It’s for WDW but it’s basically the same process (while it lasts). They may be doing standby only or LL+ when you go - I haven’t seen Disneyland specific announcements on that.
I don’t get PhotoPass generally at DL. Usually you can get a decent shot of the ride photos using the screens at the end. Only reason you’d want it is if you’re going to take a lot of Photopass pics at the castle and other landmarks.
I usually do a basic touring plan but don’t follow it too closely. Unless you’re going at a really busy time, you should be able to mostly wing it.