I always carry my lunches with me, stuffed into various pockets, because I keep kosher and my only other option is leaving my packed lunch in a locker at the base. You have a bunch of pockets while skiing, and can easily pack a sandwich and some snacks in there. Bring along some money for a highly overpriced drink, and you’re good.
Try to buy/borrow your gear before getting to the mountain, as skiwear is insanely overpriced at the mountainside shops. I’d recommend borrowing for your first time, as you don’t know if snow sports are something you’ll want to do again, and if you won’t, why invest in snow pants? This time of year, sporting equipment stores ought to be running sales to get rid of their winter merchandise, so if you do opt to buy, it should be relatively cheap.
My outfit while skiing: starting from the inside, working out, I wear undies, tights, thermal underwear, heavy socks that go practically to my knees, a turtleneck, a sweater if it’s going to be very cold (below 10 F), my ski jacket, ski pants, a gator (kind of like the neck part of a turtleneck, made of warm fleecy material, and used instead of a scarf), winter hat, goggles, glove liners, and mittens. I am prone to very cold hands and feet, and find the foot warmers in particular very helpful - they’re little sacks of wood shavings and activated charcoal that heat up for six hours when exposed to air, and stick onto the tops of your ski socks or into the toe of your boot. I think that you will absolutely need to get your hands on ski pants (don’t go in jeans or similar, as they’ll get wet, then very, very cold), a warm, water-resistant jacket, a warm hat or a helmet (the latter can usually be rented at the mountain), goggles, and good mittens. The rest can be improvised with lots of warm layers if you can’t get the real things, although I find that being cold can really ruin my skiing day, and long underwear really is warmer than a thin pair of sweatpants and a long-sleeved t-shirt. If you’re not used to cold weather, I’d error on the side of wearing the extra layer, as you can always unzip a bit or take off a layer if you get hot. Also, put on your gator first, wearing it high up so that it kind of covers your ears and comes up higher on your head than you’d initially think it should be, then pull your hat on so it overlaps in the back, then put on your goggles to hold everything together, and you get a really nice seal keeping in all the warmth.
Nobody will be grading you at the end of the day and giving out prizes for degree of difficulty. If you are happy staying on the bunny slopes (the very short, relatively flat green runs intended for the newest beginners) all day, then you’re happy and can feel free to stay there. On the other hand, if you’re a skiing savant, head over to the blues on your second day. You aren’t on anybody else’s schedule, and don’t push yourself to ski with your more experienced friends.
Glad to hear you’ve opted for lessons.
Also, speaking from personal experience, don’t inadvertently hold your poles sideways under your brother’s butt as he’s attempting to sit down on a quick-picking-up lift, causing him to slide off the chair while attempting to hold on, eventually falling off while we’re about 13-15 feet in the air. While he may recover eventually, it could take a while before he trusts you again.