Yes. Your recognition as an expert may make publishing through a traditional publisher possible. One disincentive for this route is the length of time it will take to complete the project.
Go to #5.
No. If you plan to use the book to market your business or as gifts for current or potential customers, the indie publishing route is a possibility for you.
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It all begins with you. I believe passion is what fuels your way to becoming a successful writer and a great author. Look within and decide what you want to write on and please just start writing… There’s no time to waste.