If CB Publishing & Design publishes my book, do I still own the copyright?

I have completely formatted my book and my book cover is already designed.  Why should I use your services for printing only?

Will you help me sell my book?  I really don’t know that many people.

I don’t have the full amount of money required to publish my book.  How much money is required before CB Publishing & Design will start working with me?

How do you differ from other Print on Demand companies?

I only have a hard copy of my manuscript.  Will you still be able to publish my book?