Need help please

So I’ve been acting since I could talk and I’ve been going to this theatre camp for about 4-5 years now well his year I’m helping direct 5th and 6th graders and I’m having last minuet anxiety does anyone have any tips to make the kids feel comfortable and have fun I want to make sure they have a great time as well as get things done if you have kids that are around the 5th and 6th grade age I would greatly appreciate your input