I would start by reading the Rule 5.1 docs. You'll have an easier time writing rules if you understand the basics, which your created rule so far shows an unfortunate misunderstanding of: as you'll see there, a trigger event is what will cause your actions to run. Right now, it seems like you're creating a trigger when you really want an action. Your trigger would be mode changing to away, and your actions would be the lights turning on -- or whatever complexity you want there.
As you note, this is not the only way to do this automation, and it's probably not the best, but if you're trying to learn, those two pieces should get you started. Good luck!
