Any Shyvana mains out there? I need help.

So after I got Darkflame {{champion:102}} from Hextech Crafting i want to play a lot of games with this champion. When I played Shyvana first time I was rly rly awful and I want to change. Can you guys give me tips about: "How to gank as Shyvana?" , "Shall I focus the enemy carry or protect the ally carry?" , "What to do when I'm behind?" etc. ?
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