How to setup skill shot type ability

Hey i am trying to make one of those league type abilities where the circle follows ur mouse n when u click the area it of course does the ability i am struggling with 2 things

  1. when i hover over my character with the actor my camera has a seizure ( my project and the problem im havin
  2. how do i get the plane to attach to the ground i dont want it to hover?

Thanks for all ur help!