First day in new job? how do i cope?

I am starting a new job as a receptionist at a mercedes benz showroom and it is an apprenticeship therefore i have never done anything like it before. I am quite nervous and as I have to cope for a whole day, 9-5. I feel i should prepare myself and make sure i have some ways of coping and dealing with my nerves. Does anybody have any good tips or advice? Any help would be extremely appreciated