Before you buy anything
A few things worth knowing first
Rent everything for your first two to three days. Board rentals run $30–50/day and give you access to a properly tuned beginner setup without committing $500 to a sport you've taken one run on. The only things worth owning from day one are a helmet (never use someone else's compressed foam) and goggles (hygiene).
Boots matter more than the board. Bad-fitting boots create pressure points, cut off circulation, and numb your toes by noon. Rental boots are shared, broken-down, and often the wrong flex for learning. Even if you rent everything else, own your boots. Try them on for 15 minutes in the shop — any 'I'll just break it in' pressure point won't go away.
Beginner boards are not worse than intermediate boards — they're better for you right now. A soft-flex board (3/10 or lower on the manufacturer's scale) turns with you, forgives mistakes, and makes the first week survivable. You'll know when to upgrade.
Take a lesson on day one. Snowboard technique is counterintuitive enough that a 2-hour lesson saves 20 hours of reinforced bad habits. Every resort has a beginner area and a lesson package — book it before you leave the house.