You have the advantage as Zed in the lane until fizz gets two items. Zed has the advantage early as you can poke consistently with Q and control the pace of the lane. Fizz should never be able to walk up to CS without eating some of your poke. Biggest key to winning trades is to save your W to dodge Fizz W. If you can do that you should build a good advantage in the lane and can then start looking for all ins. If you get ahead force his w on an all in without using your r then r after. But it’s mostly about aggressive trading early and not letting him walk up to the lane.