For overnighters I’d suggest staying in a hut if you’re just starting out. There’s plenty of guides for stuff like the 10th division huts in Colorado and the Sierra club huts in in CA. I’m sure there’s lots of options in Idaho Montana and Canada as well but I’m not as familiar
if you really want to get a pulk sled and bring in your own winter Camping gear, it’s probably a bit too big a mission if you’re not an experienced backcountry dude.
ive done hut trips in the Sierra nevadas a few times.. There are 5 Sierra club huts that go along the Sierra crest from castle peak to over near squaw valley. Lots of challenging and exciting terrain to ski, and a generally stable snowpack. Skin tracks are well defined and not too stressful to hike, either. Like.. fat dads do it all the time. they also have stoves and sleepers. It’s pretty cushy but gives access to tons of sick terrain nearby. You can link between a couple of them on a multi night trip... could even link 3 of them on a 5 day 4 nighter with a snow camp on night 3.
check them out.
additionally there’s the ASI hut near donner lake ASI runs guided trips there and has a bunch of other guided trips like the Sierra high route and shit. I’d check them out if you want to do some legit guided trips in some unreal terrain.