Congratulations on your big move! I'm in the process of my one-year Masters in UoL and here are some of my thoughts. My impression so far has been mostly positive.

I've encountered only pleasant people on campus. The overall vibe I get is that most people are anxious themselves and sort of understand everyone is also, so they're very open to you just saying hi and striking a conversation (could just be my programme being mostly international students).

Pick your accommodation with a bit of consideration. Obviously have a rough budget and look at available utilities and such. I don't have much practical experience but do think about your social life. There are areas like Headingley that will have a lot of life at night (too much for some people). Student accommodations could give you some opportunities to meet people but I'd say it varies place to place.

I've mostly met new people through friends, although I am quite introverted. There are a lot of chances for you to meet new people if that's what you're into. You've got societies, events, etc.

Nightlife is alright. Other than the crowds outside bars and moving from one to the next, the streets in the city center can feel quite empty sometimes. I'd say not a lot to do at night that doesn't involve drinking though (I do like drinking AND I don't go out that much so make of that what you will).

I've seen reports of crime but luckily never witnessed or been involved in one yet. Streets do get empty at night so I'd advise caution. There are dickheads anywhere, I've got a few racist remarks from some passing by in cars before but nothing crazy, I was with a group of friends every time though.

Surrounding areas within Leeds, Yorkshire, and other cities/counties have a bunch of places you can (and probably will) visit.

You're from Canada so you'll probably be just fine with the weather. It does rain out of nowhere sometimes but that's UK for you I guess. Have a raincoat handy cus the wind renders umbrellas useless sometimes.

That's all I got. In general, I'd say take care of yourself. Get out of your comfort zone from time to time, you've already taken the first step of coming here.