Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
1 (Start) Doran's Blade (Recommended) Item Costs: 435
2. Doran's Blade, Item costs: 435
3. Doran's Blade, Item costs: 435
4. Berserker's Greaves (Recommended) Item Costs: 920
5. Phantom Dancer (Attack - Critical) Item Costs: 3395
6. Last Whisper (Recommended) Item Costs: 1965
7. (Sell 1 Doran's Blade) Frozen Mallet (Attack - ?) Item Costs: 2360
8. (Sell another Doran's Blade) Infinity Edge (Recommended) Item Costs: 4080
Start out with 1 Doran's blade, and be sure to go mid. When u have enough money, go back and buy 2 more. This really helps in getting a good start of the game, and you can kill other champions pretty fast. Be sure to be defensive, and never jump into a fight with many enemy champions alone. A good idea is to soften up enemies b4 nuking them.
Explosive shot really helps gaining XP and gold. When u slain an minions with it, it will also give alot of damage to the minions and also champions near. (Gold is needed for the items in this build, they are very expensive.)
Rocket Jump is used to evade from enemies if in trouble, but also used to jump into a fight.
Ultimate: Buster Shot. Always upgrade when availiable. If you are going to be offensive, you might wanna use Rocket Jump over your enemy, then shooting you ultimate at him so that he get pushed longer into your lane.
Good Luck! Leave a comment if you have a question :)