No worries at all! I'm gonna try to answer stuff to the best of my ability:

1. Setting Elements are picked up by anyone and are like .... little fragments of the GM? Like imagine if you could put on the GM hat but only for one part of the setting.
2. Rituals can be done whenever, and basically change the rules of the game for the duration they're going on. It's like shifting to a montage or something, and you go around and each person does one of the ritual moves, until you want the ritual to end.
3. The corkboard is a big map of what's going on in the game. It connects people and places together. At the start it doesn't matter much but towards the end of the game (if you're playing a 3 act game) it comes up.
4. Setting elements can make them whenever they want.

If you have any more questions about what it's like to play Sleepaway, check out this amazing podcast featuring Brennan Lee Mulligan, Molly Ostertag, and Noelle Stevenson (among others):Part 1,Part 2,Part 3,Part 4.