Before you head into ranked:
Make sure you know most of your lane matchups. Ask yourself:" At what level can I successfuly trade against X champion? (ex:Olaf should all-in someone at lvl 1) What items do I need? Should I rush a specific item for this specific scenario? (ex: Sunfire over BlackCleaver in Darius vs Riven) Am I paying enough attention to the minimap? I couldn't care less if you have good scores in normals. Learn most of your matchups and be sure you won't get outraded/die every time you try to engage.
-Because I will flame you-