You can choose to print your book as a colour book, where the pages are slightly heavier and glossier. But they're also substantially more expensive. That's the trade off. Whether this quality will be enough for you, I can't say, because peoples' standards of acceptibility differ.
Yes, you can upload single pdfs and they'll be printed as a 'normal' book, with page 3 being on the back of page 2. However, if you want full bleed, with your images stretching to the edge of the page, you can only upload your work as one whole pdf file, with its page size set to a quarter inch wider and taller than the book that you're printing - so 6.25 x 9.25 inches, for example.