I'm starting my new job in telephone customer service today
That's great. Do you think you'll be good at customer service?
I'm usually good at talking to people. I should be able to do it well enough.
Looking forward to a new job is good. You should make sure to ask plenty of questions. That way if you lack the skills you can build them on the job.
That's really good advice.
I think it's great that you're showing such strong initiative in your new job. I'm sure that means you'll be good at it.