There's probably not much to add. Bracket races are self explanatory; you guess your ET, then run as close to it as you can. Closest wins. Doesn't matter if you have a 9 second car up against a 13 second car, they run together. Quick 8 is exactly that, the quickest 8 cars in the field do a run-off.
Dragway 42 is a 1/4 mile track that has recently been re-done, so I see no reason why they would run 1/8 mile.