How did you format your book to submit to iBookstore? Did you have to use a book designer or could you just put it into Word for Mac? I'm trying to decide between iBookstore and Amazon KDP for a series of book I have in mind. They are non-fiction and I have published with hardcover publishers previously. This time, I don't anticipate anything but an ebook. I will also use my own cover design and I do have a tax ID number, so no problem. Plus, I do write on an Air, but I don't have 1MB/sec uploads on my DSL connection.
Any advice from anyone would be appreciated.