I've dislocated it before. Pretty severely as well - not from snowboarding but from wrestling. Went for a takedown and my friend slipped and fell on my arm, hyperextended it completely the other way around. It was pretty gross. Popped it back in, got an xray, and within the next couple of days, my elbow reached the size of a grapefruit.
1 week for the bruising to fade a bit, another week for the swelling to subside, by the 3rd week I was almost ready to ditch the sling. No rehab after that (I'm an idiot) so my elbow still slips out every now and then (it's been a few years). Get PT/rehab that ish so you can maintain full mobility and flexibility, and most importantly strengthen it when you can to make sure it's stable. You'll be pretty much fully using it in a few weeks.
If I could recommend anything for you to buy, it would be some kind of neoprene sleeve with an elbow pad at the end of it. For physical activity, it's great as it'll keep you from banging it on things. The sleeve will be tight and will offer some stability, and the heat retention will keep it warm. Compression keeps the blood flowing. I have one, and I have another lighter duty one that I wear whenever my elbow feels a little weird during regular days.
Take care of it!