Season 6 Advice for Climbing in Rank
TL;DR - Don't start right now. Wait at least 2 weeks preferably up to a month.
Some of you might call me crazy - I was a Diamond last season and have not played a single ranked match yet this season. Here's the thing though - everyone is getting demoted and the higher you are the harsher the penalty is. For those who don't know your MMR from last season is averaged with 1200 (Silver 4) and slightly changed based on your placement match. Because of this, everyone is going to get slightly lower than where they were expecting to be especially if your MMR was too low for your division.
Now why shouldn't you start right now? Well because it's happening to everyone! In my case for example as a Diamond I'm going to get placed into Plat. I know I have the playing skills of Diamond but I am aware that all other Diamonds are also going to be placed into Plat. I'm not unrealistic - I know that after my placement matches I will most likely lose as often as I will win. This will lower my MMR that has just reset and make it harder for me to climb and require more games to bring it up.
Now what do you get by waiting at least 2 weeks? Proper placements for everyone else. Yes, you'll still get demoted a whole rank in all likelihood unless you were silver and bronze where the penalty may be slightly less. The difference is, when you start climbing you'll face lower skilled level players and therefore will win more games (those players will actually be in the right division as they will have started before you).
It's not unlikely that you could get a double rank up! Personally I don't care if none of you take this advice, but I hope that you keep it in the back of your minds.