Finding a translator and what to pay them

Hello,

I am a journalist who will be in Ukraine in mid-April. I will need an interpreter to help me during interviews - both in Kiev as well as in nearby towns. I am not sure how much work there will be. Probably 10 hours in total. But I am not sure where to post the job, or how much to offer as pay. There is no writing involved in the job.

Any advice would be appreciated.