i got a job at a preschool just have to pass a background check and I'll pass iy I've never done anything wrong or illegal

it's something that i really want to do and I know that I would love it and I am excited about it but I am nervous about it too because I want to be a good employee there and I don't want them to think that I cant handle it and I don't want to fail at being a good teacher. they obviously saw something they liked about me to want to hire me and I don't want them to regret hiring me. I don't want to let anyone down and make them feel like I can't do what they want me to do. but they'll probably train me for it.