The show lotteries using paper tickets hasn't changed. Depending on the show, the cutoff for the lottery will be 15 minutes to one hour before the show starts (just assume one hour to be safe). You can do the lottery near Gondolier Snacks on the left of Mediterranean Harbor in Disneysea and next to the Star Tours Fastpass distribution area in
Disneyland.
It won't be hard to miss the stage because as you walk right past Zambini Brothers towards Soaring, you'll see everybody already waiting there. In that general area, you can ask a cast member which areas are sitting vs. standing.