2. Know your position - If you are left with being the jungler and don't know how to jungle, TELL THEM YOU AREN'T A JUNGLER. It's good to know basically every position before going into ranked games but sometimes people get impatient and want to go in before that, not that big of a deal. If you do jump in before that, at least call a position you know and play a champ you know as well.
3. Don't be a dick - I can understand raging a little in chat about someone's performance, but don't make up shit in chat about what other people have done or said. The Tribunal can read in-game chat (wish they could read post game and after game chat as well but they can't). So what you say in game is recorded.
Those are just a few things I hope you guys either now know or already know before jumping into ranked solo or duo. Thanks for the time!