Start with corruption potions if you fight a lot it will help you hold the line, I usually use it in conjunction with the "Time Warp Tonic" rune to move quickly around the map.

lvl 1 Q, lvl 2 W. Why? That combo will help you do a guaranteed trade and good damage along with the shock rune, if they force you up the E you can do it.
Arm yourself with eternal ice against fizz and zed.

If there are a lot of champions that heal, build Liandry and Morrellonomicon.
If there are squishy champions, arm Luden to delete them.
If you think it will be a long game and it will be difficult for you to kill, arm yourself with eternal ice, cdr and play for your team.

- You can cancel animation of Q and E with flash.
- W will target nearby targets, or just the one you're targeting.
- Remember to use Q spin wisely :)
- I recommend using ext against champions that erase you, for example Zed and Fizz.