Can I use the word processing program that came with my Mac?
Sure. It’s just sort of a Word Lite product. In the end, assuming your book is straight text, you’ll want to save your manuscript as a Word doc file or as a PDF file before submission. And remember, no extra lines, no extra spaces after periods and no tabs for indenting. If you’re using CreateSpace, download their formatted template and conform your manuscript to its requirements. Keep it simple and you should be fine. If you paint yourself into a corner, hire someone to help with your formatting. Don’t let this process get in the way of writing and getting it done.