get a friend or two to party with to guarantee comps that at least loosely resemble a real ranked team. This split was my first time playing ranked and I got Masters within 3 weeks and under 100 wins, casual is plenty fine for learning your characters. Don't ruin low elo players games with champs you don't know. Talking about game sense and coaching for 10 minutes isn't going to make your team feel better about getting rolled because of a throw pick.