Advice for training.

So I had a interview 2 weeks ago at a bakery. The manager who is also the owner (she didn’t say she was the owner in the interview she says she only tells people that when she calls them for the job) anyway she texted me yesterday saying give her a call and when I did she said she been trying to call me and how she thinks I’d be a great asset etc etc. anyways she said will you join us is that a yes and I agreed then she texted me today and asked me is training tmmrw from 9-1 okay and I told her it was fine. I’m nervous because I’ll be her guest service representative and she said we also do crafts like decorate the cakes and I’m nervous because I have no experience doing any of this. I’m a freshman in college the most I’ve done is work with paperwork. So I don’t want to mess up. She said if I do good on the trainer that’s when I get my uniform etc. she’s really nice and we had a lot in common. I just want to know some tips that can help me or that can make me less nervous. Idek what to expect or what to wear. I know I don’t have to dress professionally but I know I don’t have to dress too bummy either.. I need lots of advice lol