Do you have a favourite player? Are there any people local to you (local friends) who cheer for a specific team? Siding with those friends will make it easier to cheer for a certain team whereas picking that team’s nemesis would make for some fun, argumentative/debating discussions.
I never was into soccer/euro football but spent 4-5 months with some guys from the UK overseas.
They were all avid ManU fans and despised Chelsea. They didn’t really like Liverpool either so the other too 4 team was Arsenal.
I can’t name a player on Arsenal right now but I’ll cheer for them if they’re on tv and I am watching.
As for hockey, you could pick the newest team, the Vegas Golden Knights. Or you could pick one of the “original 6” (Toronto, Montreal, Boston, New York, Detroit or Chicago).
Or pick a team that is winning a lot right now. Just check the standings and choose your team.
Have fun!