Pretty much what Rampant Rabbit said, rush a giant's belt or something, start with either bead +6 pots and a ward or flask + pot + ward.
Get a brutalizer early, then make your t-force, finish cleaver, then finish your warmogs or go for the last whisper. Add in GA or Locket/Bulwark to the mix and you'll be a carry-demolishing machine.
Skills: Q>E>Q>E>Q>R>Q>W>Q>E>R>E>E>W>W>R>W>W. You don't need W early because it's too mana intensive.
Runes: I'd go 9x Arpen Mark and 3x AD quint, seal and glyph should be obvious.
Masteries: 9/21/0, you don't need 21 in offense, since the build allows you to decimate enemy carries in mere seconds.
~Advice from a Gold I 100% J4 winrate player. Don't disregard bruh.
Don't you dare mention that abomination here, mobafire builds are written by people who usually don't even have a clue of the game, don't even try those builds lol. Lolpro/Solomid ftw.