Sorry it's late I assume you're already at work or done your shift!
To answer your question, my first job was at a clothing store and I was 16. I was really nervous because I was the "new one" but there were 2 other girls also starting so I wasn't totally alone. We got a tour of the stockroom, staffroom and shop floor, shown how to do things and where things go. Then we were left to it really. Everyone was really friendly and kept checking in on me every 45 minutes to an hour to make sure I was alright and if I had any questions. I quickly got settled in. I was there for 15 months before I left.