What I would do is create a boom attached to your Characters Scene Component or Capsule component (Whichever is the root) then attach your camera to the boom.
So in your character’s blueprint, add a spring arm component to the root component. This will be represented by a red line. Then create a camera component as the spring arms child this will attach it to the spring arm. Now edit your camera how you want, and the spring arm component settings control how the camera will follow.
You wont need to create a graph to do this, as its all done in the viewport and using components.
Heres what mine looks like:
This makes the camera always follow the character and stays on him wherever he goes. Now, mine is a hard snap, so its a rigid spring arm and just follows my character with no pizazz. But the default spring arm will automatically adjust its length (Zoom in zoom out) based on if an object obstructs it, and you can set the camera to have a follow effect, or more gradual movement etc.