Im pretty nervous

So im 15 and well next week so on Monday-friday ill be going to this work experience thing and yet im absolutely terrified like only 3 people out my school got in. (there was only ment to be 1 but my teacher is friends with the person that well allows people in or smth) Anyway there is only 3 of us and its an hour walk from my house and its my first time doing anything like this any sort of suggestions on how to prepare or anything of that sort?