We can't stress enough that changing to clean beauty involves you becoming your own teacher and advocate. A lot of information to do with ingredients and chemicals in our products is hard to find and research. More mainstream brands may try and "greenwash" their goods and mislead you into thinking you're buying something clean when you're not. So it's important to learn as much as possible to make the transition easier for you.
The Nature of Beauty by Imelda Burke is a good place to start: it's easy to understand and gives you the power of choice in what you're buying and putting on your skin. Whole Beauty by Shiva Rose is also a great read — it's full of simple DIY beauty recipes, information on products, and helpful tips and tricks from Shiva, all packed into a beautiful book.