Hi all, this is my first guide and my english is not too well, so sorry about this...
I'm a LOL player from the start, i had first a lvl 30 on US server and now i had a lvl 30 on EUW, my top elo is 1450 in ranked solo/duo but i don't play 5v5 very well. I play 3v3 from the start and tried out all the champion many times.
Recently i have focused on a Zed build that i think is very efficiently.

For the runes, i suggest to take over the most damage possible damage possible and Cd on Glyph cause help to spamm ability

Classic 21-9-0 with all the line for damage and the tankyness from HP increased

Very important for this build is to max first living shadow then Razor shuriken for 2 reason:
1) lower the CD cause in TT i use living shadow many times;
2) Benefits from the passive boost at AD.

For the Item i start out with 2 pot, The boots and a longsword.
Then i close the last whisperer that make zed very efficient from lvl 6 in early ganks.
From Now on i close the boots and take the ruined King to close the build; if the game goes on i usually take the frozen mallet for the HP and the utility in combat.