I've been playing LoL since 3 months after it came out and I've been a huge fan since. I've gone from one main champ to the next but finally I decided I needed to settle and focus on one main. After Fizz was released, I knew I had found my main. Fizz has some great manuverability and tricks hence his name,"The Tidal Trickster".

For summoner spells I take smite/ignite. This gives me the ability to smite the jungle creeps to improve jungling and ignite for the extra dot damage. I use smite very often to increase my gold income with the improved smite through Summoner's Resolve mastery giving and extra 10 gold per smite usage. I take ignite because it works well with my seastone trident well. Once you get red buff and gank a lane it's nearly impossible they will make it away fatally wounded if not dead. The combination of the seastone trident DOT and heal reduction, red buff DOT, and ignite heal reduction with DOT makes for some insane damage output. I only recommend these spells for skilled players for you give up the ability to escape or chase with flash and ghost and also give up heal and exhaust. (All are good spells choices for fizz based on you playing style, but I prefer to use smite/ignite) I would recommend that you only use these when you are sure you can escape with you dash from urchin strike or hop away with playful/trickster.

Fizz can easily gank and manuver through the crowds of champions and minions with easy but remember some of the draw backs. If you don't use your Playful/Trickster wisely or correctly, you make find yourself dead when you could have used it to hop over a wall or dodge a spell, but instead maybe have used it to jump into the fight, slow an enemy champion, or even to damage enemy champions. My personal opinion is to save it only till desperatly needed or only use it when you have blue buff on yourself or some more cool down reduction. Though this is a solid build for offense and hard dps, you have to consider the defensive also. If you feel you need the health or defensive items try using offensive health items such as trinity force or frozen mallent, or rylais. If you need some stronger defense or tend to die frequently, try buying items like guardian angel if you are focused down in fights or even just need that extra life. Fizz takes time to master. I'm still mastering him to this day but once you understand his mechanics and trick you will surely prevail.