New sales job and stressed out

So I just recently started my first day on a sales job and to be honest there’s not much training, I started cold calling and dialing numbers 2 hours into the job on my first day with a brief introduction of a script and such but there’s so much to know and learn about our services, the web interface im using such as the database, multitasking, I barely understand the service we offer which Is complex. I barely shadowed another rep but she’s been kind and helpful. It doesn’t look too complicated but I’m still getting nervous. I made 40 something calls zero appointments. Any advice? Is a typical in my position to not succeed weeks in or even months? I only book appointments and not the entire sales process