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.
Pretty straight forward build. Gives a decent early game defense so you can build towards a more offensive late game.
As far as items go, the Ghostblade can be traded out with pretty much anything that increases attack speed or damage. The Madred's Bloodrazor is a good choice since it does both and gives a great on-hit effect.