Hello
I would love to know how do I add AI to my game how to give them damage and how to give them a health bar and inreturn i want to know how to make them damage me and how to place a health bar for my self THANKS 
That’s quite the question! Here’s a couple of things to explore.
Making Game Ready AI: A recent live stream series that Epic has been working on using Blueprints
Basics of AI: Another Epic stream they did last year
Creating AI in UE4: Solid series covering AI by Asher Einhorn
Shooter Game: An excellent example if you’re looking to learn C++