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.
Starting Jungle Path
Always start on whichever side your bot lane is on so you can get the extra dank leash.
Here's pretty much how you can do this. It's entirely situational so look at how your game is going and respond accordingly. I know it says Gromp the whole way through here but if you start on the other side just go with whatever camps correlate (Krugs -> Red -> whatever).
Gromp -> Blue -> Wolves -> Gank Mid
Gromp -> Blue -> Red -> Gank Top
Gromp -> Blue -> Red -> Scuttle -> Gank Top or Mid