mid, Dont go top because most top out damage you and your ulti is useless on them because theystack health, while in mid u can easily zone out squishy mid while out damaging them and your ulti is more usefull because ap mids are usually not tanky.

Zed, although quite outclassed and impaired due to the fact that his design and execution don't match, is still much better then most AP mids. Since that's the place where he outclasses the most heroes, that's also where you should play him. Remember, as mid you could transition to roaming mid game, should you wish.

Level E followed by W. If snowballing, stack bloodthirsters and build some penetration if your opposition builds armor. If not, build tanky dps. Armor Pen and AD Runes always. Zed syncs with movement speed very well. Yo do the most damage from your abilities. Even when built Tanky Dps you shouldn't be consistently auto attacking.

id say jungle > mid > top
zed's laning isn't too great against most champs

as a counterpick, not as a specific lane, because zed fits in a lot of places

Preferably, he does well in mid. Top lane he can counter squishies, and also poke down some bruisers too, because he has a reliable poke/escape.

Jungler isn't really too good honestly. He can clear fast but his ganks don't really kill until lvl 6 or higher.

Max E, W, then Q as your final skill.

Always start out with 9 hp and 2 wards for top and mid lane.

Your final build should include some of the following: Ionian/Merc/Tabi, Blood Thirster (x2 if you want), Black Cleaver, Last Whisper (Optional), Mercurials (Optional), Guardian Angel, Warmogs (Optional), Maw of Malmortius (Optional), and Sword of the Divine if it's a stomp game.

i normally play him Mid but hes also a good top laner

Jungle, because if you waste your W in lane, the opponent will all in you, push you out or kill and you and then free farm.