In a pod of 8, Pick 9 in a pack will be your first pack wheeling. You’ll only get to see the first 5 packs wheel around (in 14-card play boosters), and a lot of the time those last 1-2 picks in a pack will be a basic land or something completely off-color for you. Don’t worry too much about it as you start out, but yeah, it can help indicate a color that’s very open.
Premier draft should be a full pod of 8. Older sets have 15 cards per pack in draft boosters, but I want to say it was around MKM when they switched to 14-card play boosters.