Regulations for Flying Drones in Sri Lanka

Hi all,
I am about to buy a drone as i’m willing to increase production quality of my travel vlogs. But i’m doubtful about the fact that it is restricted to fly drones without permission. So, can someone help me with these,

  1. Do we need to take permission from any authority?
  2. If yes, is it valid for a specific region?
  3. Do we need to renew the permission after a time period?
  4. How much does it cost?