Let me start off by saying this is my first guide ever so criticism and feedback is welcome. I've been playing Fizz a bit since he came out I'm not saying I'm pro or anything this is just how I play him.

Greater Mark of Insight x9 - I feel there isn't a better selection here.
Greater Seal of Resilience x9 - What i use but another good choice is Greater Seal Clarity
Greater Glyph of Force x9 - Good for that extra umph you want . 2nd choice Greater Glyph of Warding
Greater Quintessence of Potency x3 - Gives you exactly what u need.

The new masteries are crazy but i use 21/0/9

I usually start with Doran's Ring you can however use boots and 3 health pots. First trip back should be getting either boots if u didn't start with them or Catalyst. Then you need to finish your Sorcerer's boots and RoA. Lastly each time u decide to go back grab Lich Bane then Rabadons then a Guardian angel if needed. If u want to sell ur doran ring n grab a Void Staff just to penetrate more of there resist.

Surge + Exhaust first pick / Flash + Ignite is another good choice for new players