Masteries

Offense:
21

Defense:
9

Utility:
0

How the game should go. 

So off the bet you have to help your jungler.  Invade if you like maybe steal the other teams blue if they start at red or vice versa.  Get your jungler to babysit top so that you can guarantee a kill.  Then the farmfest starts so farm 'till you drop.  Also ward their blue if Vi gets a blue you can harass and farm all you want.  When you have your ult you go help your team at all times.  Be aware of the enemy jungler and you will dominate your lane.  you don't have to do anything more then that.