Not Updated For Current Season
Okay u want to get as much kills in the begging as u can cause it will give you a nice boost to keep killing and dont die so much in mid and then u will easly do it well , if u fail at the start everything will mess up so dont do that ;)
The first thing u should do is getting Doran's Ring and 1x Health Potion to start off easly and put 1 point in Shadow Walk, u want to lane with a tank or a good fighter so u can do some easy kills to start off with.
If the killing goes well in the start u should start build Mejai's Soulstealer to get a nice boost and starting some real raping. Then u just keep following the ''Item Build'' that ive made at the top and that and u will have it good as a raper.
Some things about your rotation when u are 1v1: Start off with Shadow Walk then use Ravage to make nice damage and make and turn on the stun from Shadow Walk after that your target should be pretty easy to kill just normal attack the target and spam Hate Spike to make dps. OBSERVE!! Try to attack on ''Squishy''Champs NOT Tanks or champs with much hp and Magic Ressistance.
Rotation for teamfights also 2 players + is : Start off with Shadow Walk then ONLY spam Hate Spike and use Ravage as a finisher so u guarantee will get a kill. And ALWAYS Look for some1 to gank , u will be called ''Noob EVE. Killstealer'' and stuff like that but u will make your team win.
The Guide is not fully complete with all stuff but this will be enough to start off with . Good Luck and go Raping :)