If I have designed your print book and you wish to have an e-publication too, that is just another step on your publishing track.
I will create a file formatted for Kindle and an epub file suitable for the other eReaders. The cover will be embedded in these files. You will receive both validated files along with the cover file for you to publish at your chosen book seller.
I do not upload your files because you will need to set up your account so you can get paid when your book sells. There is plenty of help available for this and it is really pretty simple and I do offer advice if you get stuck on it.