Hello, Fuff-Fuff! Welcome to the Xfinity Forums.
Here is a quick guide on what to expect with your first bill that I think you may find useful: https://www.xfinity.com/support/articles/what-to-expect-with-first-bill.
You won't see the bill on day one as it needs time to generate and print, but your first bill will include:
Note: In some locations, your service activation date may indicate the start of your billing cycle and you may not see any prorated amounts on your bill.
Please let us know if this helps or if you have any further questions/concerns that we can answer for you.
Fuff-Fuff, as I have not heard back from you in some time, I have closed this thread to further comments. I hope the information I provided answered all of your concerns, but if you still need assistance, please feel free to start a new thread.