When jungling Vi utilize her e and q to funnel damage on camps. Use q to go through walls to start camps and to escape enemies. Q will stay charged during a flash. Vi's combo is q for a slight knock up followed with and auto then immedietly e. This allows w to get its bonus in making Vis ganks quick and devastating as early as 3. Try to not start team fights with your ult. There is always the exception but for me I shy against it unless fed.