Help on Fizz Midlane

So I bought Fizz today because I have seen many people doing the ability combos and killing enemies in no time at all. I learnt the basics in bot games and I played a PvP match after. The midlaner in the enemy team was Vel'Koz. He kept using his W so I could not go forward and farm. My outer turret was the first turret to be destroyed. They kept pushing mid and almost destroyed the inhibitor but Evelynn, my jungler, bought Rylai's and killed everyone. In the end, she got 36 kills but our team lost. I felt bad to the whole team. So, may I have some tips on Fizz early game?
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