How does one start the process of starting or selling an idea for a website and/or book?

To answer in part, with a book, your words are copyrighted from the first moment you set them down in a notebook or in an e-file. If you are paranoid about someone stealing your content, just make sure that you keep some sort of record of what you are writing. NDAs are almost never used in the publishing arena, except with high-level executives at publishing houses regarding company strategy and such. I've never heard of them being used with authors, and I would think that most publishing professionals would find them patently offensive if an author brought up the idea. There is no way in publishing that you can ever protect a topic or even an idea. That is simply not possible. You can protect, however, your work on that topic, your creativity as shown on the published page, and your mode of expression. As for the rest of your question, starting and even finishing either a website or a book is fairly easy. Just do it. It would pay to learn HTML, and this is surely not difficult to do. Writing a book just takes time and inspiration. Selling an idea for a website or book is much more difficult. While I cannot speak for selling the idea for a website, I can say that an idea for a book has little or no monetary value in the publishing world, no matter how original or interesting the idea might be. Publishers pay authors for completed manuscripts--they don't pay authors for ideas. While you can try to pitch your idea for a book in a query letter and see if a publisher is interested, unless you are famous or someone they have worked with before, in the vast majority of cases the publisher will want to see a completed outline and sample chapters--if not the whole book--before they will even think about signing you to a contract.

First I think Howard H Aiken said it best: "Don't worry about people stealing your ideas. If your idea is any good you'll only need to ram it down their throats" (http://en.wikiquote.org/wiki/Howard_H._Aiken) Ideas on their own aren't very valuable. It's all about how you execute your idea. It's very easy to build a website nowadays. If your idea is a website or a coffeetable book I'd suggest setting up a tumblr and seeing if you can get some traction. But seriously, stop worrying about people stealing your ideas. It isn't going to happen.