What not to do after watching LCS
Don't blindly copy the professionals. Professionals do what they do because they ARE PROFESSIONALS. They know how to make full use out of any champion's kit, and thus, they are capable of playing something that is not in the solo queue meta. Unless you have been doing something like Mid Lane Ezreal, Hecarim Top, or AD Bruiser Karma Top, or whatever Voyboy just got doing for years, don't just pick it up and expect good results. You will not only get demolished your first 3-20 games, depending on your champion, but you will immediately hurt your team's morale.
This is not to say that thinking outside the box isn't bad. What I am saying is don't try a new strategy without thinking about how it will work.
Example: (BAD) xFioramaster18 is trying out Support Fiora in the LCS, and he wins! I should immediately do that in Ranked now! FREELO!! (Good!) I think I can make Jungle Leona work! She has a slow clear, but once I get past the first three levels, I can go on a ganking spree!
EXCEPTION TO THIS RULE: Ward like you're getting paid to do so. Copy the pros on this.