At the start of the game, your early game will be quite bad, but your power spike comes at lvl 3 when you have learned all 3 abilities, Q, W, and E. This is when you can poke the enemy with extremely high damage. When the enemy is behind their minions, leap in. This will force the enemy to run towards their turret and away from their minions. When this happens, auto attack to proc your passive, Q, and if they fight back, use your W for a slow and extra health back. This combo works best against ranged champions with no good escapes. After using u your passive, you can run into a bush or run behind your tower to refresh it. You should be able to get a kill if your jungler comes to help. If you are struggling, you can always take a trip to top or bot lane for kills and assists.