Make sure to main your heal.
Your priority is to support, which means that you have to keep your allies alive. In most cases in you will be in bottom lane with an AD range so you must place your wards in the bushes and the river to prevent any incoming ganks from enemy players. Remember that your Carry is more important than you, so you must heal him to keep him alive and at as much HP as possible. But don't worry because this build with give you great mana and Health regen that you won't need to heal your self much. I hope that this guide has helped you out and remember to keep awareness on your allies so you can use your Ultimate to help them either win a fight or get out of s sticky situation.