Great news. I am glad to hear that you are ready to publish.
To add to what other community members have said, I would recommend also asking the e-book publisher about its specific copyright laws. It's a good thing you thought about it.
Do you have a publisher in mind? Try reading the Literary Market Place book at your local library for more suggestions.
As the saying goes,
first the Dread,
so remember to Dream the Descent.
No despair- it is the Decision.