Accident costs

Heyho, I don’t know if that’s the right area, I’m trying. Unfortunately, I looked too little in the rear mirror today while driving backwards and drove a 1 month old polo against the bumper. the is now in the license plate area and above and the paint is damaged, with me it’s only scratcher. can anyone tell me which approximate cost I can expect? so with regard to insurance around and around. this was my first time now, therefore please after the ask tails if necessary.