Website e-book

I would like to setup a website for my son to help with his modelling career [first steps].
It is important that this is locked so that we can invite people with a password to access it. We will need to register a new domain name for this.
The idea is that this will be an e-book. First page will have summary info, then the rest of the book will have photo images. Ideally we would like this so we can modify and edit it along the way [ie: add new pages, change pictures in and out etc]. Open to ideas on how to lay it out in a funky format.
Ideally I would like the person who does this to support ad-hoc in the future if this is ok [ie: if we want to make changes to the style, add content, features etc].
For now this project is to get the website up and running with the e-book as a fixed price project