In terms of just dealing with the cold -- what's the crack with layers etc? I can't seem to find any jacket that isn't like 200 quid
Welcome to skiing
I haven't been for quite a few years now but layers for me was always;
Top;
Thermal longsleeve top
Tshirt
Fleece (zip-up helpful here for getting hot)
Jacket (ski jackets are usually mid-weight, not feather/insulated as you'll boil alive)
Gloves
Hat
Bottom;
Ski socks
Thermal leggings (top tip, get 3/4 length so they don't rub in your ski boots!)
Salopettes/ski pants
My usual memories of skiing temperature is 99% being too hot and sweaty tbh, but safer that than catching a chill. Especially for beginners as you'll spend more time falling over, sitting in the snow etc. and being wet.
I really would not advise skiing in sunglasses, your face will hurt, you'll get windburn/sunburn and you'll probably crash and lose/smash them in the first day anyway since you're new. Do carry them though, as you'll want them for lunch/coffee breaks etc. Leave skiing/boarding in sunglasses to the posers.
I'd also massively recommend a camelbak, you will sweat and dehydrate and get altitude headaches. Also essential to carry on your person;
Camelbak/water
Snickers/chocolate
Hip flask (sounds hipster but actually very worth it/common)
Paracetamol
Lip balm
Sunscreen (you absolutely
will get burnt)
I'm sure all that was online somewhere but I'm listening to a very boring meeting and reminiscing about my ski days
I'd also look-up some ski exercises to do before you go. Skiiing uses very distrinct upper leg muscles that you won't even know existed. Doing some running, doing some high step-up exercises (onto a coffee table or something) will get you somewhere near into shape. Along with 99% being hot and sweaty, every day ends with completely dead legs (like, struggling to turn/get down the noob slopes safely

) so the more you do beforehand the better.