Startup Overseas Forums

Hi all! So, my company recently got an offer from a client living in Graz, Austria. He wishes us to do website and video marketing for his musician band. By the looks of it, campaign should be simple and doable... The client wishes to pay us on a yearly basis. My problem is that i cannot find any reasonable info on how much we should charge such a service!? So if anyone has some personal experience, or insight on how much such services are being charged in Graz or has some knowledge where i could find a pricing range it would be of big help! I know it seams as a silly question but any answer would be of big help... Thank you!