Early game you just want to poke the enemy/enemies with your Q. Also early game, use your W to scare off enemies, or if they stay in the premises, Q them then hit them. Late game when you have all abilities, the best combo is to use your Q, wait for your Q to cool down, ult them, use your E, Q again, and hit them. This should do a massive amount of damage to a single enemy. If you choose to lunge into a team fight, the best chance of survival is to use your W right away. They wont be able to hit you and you can keep damaging them.