Dont go attak until you are in level 6. Use your R then use your Q and then your E and if they run away place your W infront of the enemy then use the Q again and Then R and then E.

Q will throw a blade on to the enemy and the next hit wil the enemy explode.
W will make a circel that slows the enemy and make you invisible if not hitting.
E will Alice the enemy.
R will jump over to the enemy and hit them.

In early games use the Q ability to farm minions until you are in level 6