My first time working with kids and at a summer camp.?

I could really use some advice/guidance here. I am going for my MSW and doing an internship for the Summer. Part of what the agency does where I am working is run a Summer Camp for kids. For part of my I internship, I will be a councler at the camp. I have never worked with kids before and I am really nervous. I have never been comfortable in working with children and am unsure how to interact with them. I am also afraid I won't know what to do if something goes wrong. Any advice or guidance would be very helpful.