Only assassins are pickable
Don't go in only to leave because you didn't read the description. Don't be that guy. I've been in a que for 20 minutes because of people like that.
You have to lock in
This isn't one of those gamemodes where it locks you in for you.
Change your summoner spells
Nothing is more embarassing than when you load up and still have as your summoner spells. GTFO
Play the objective but don't die for it.
Don't rush into their jungle, expecting to get 100 points off the gouls, only to die because you didn't know they were there. Stop.
Ward ward ward ward
Vision is essential in this new game mode. You have to see what you can before they just insta kill you.
Abilities work on the sentinels
Don't be afraid to just hit them with abilities. It's not like you can only auto them.