This is a topic near and dear to Charles D’Amico (The founder of Blue Handle Publishing and the Book Puma Services Platform). The easy answer is anywhere from $150 to $2,500 (minimum) if you self-publish and really look for deals and lower-end services. The truth is that this cost can easily exceed $10,000 and there are even services out there that will cost you $50,000. The editing industry has a range of costs from the discount bin to the penthouse in downtown Manhattan.
Book formatting can often be confused with book editing, but they are two different things. Formatting is how the margins, font and overall structure of the manuscript are properly laid out. For example, if you make a mistake on how the margins are scaled, then you can have text running into the interior binding of the book making it hard to read.
Book cover design is almost as important as the manuscript itself. Even with the greatest marketing campaign, if your book is hard to find or the cover turns off the readers it's going to affect sales. You have to know your audience (reader and genre) and make sure you work within those fields. One of the strongpoints of Charles D’Amico’s approach in the beginning was/is his covers. Even industry experts have spoken about the detail and approach to his covers. Charles didn’t spend a ton of money, but has an artistic background and found a great person to work with. This allowed him to put together a plan (or storyboard) for what he wanted, then trust the artistic talents of the designer.
This is a loaded question. Especially since you are essentially becoming a small business owner if you go down the self-publishing route. If you self-publish, the cost to publish can vary drastically from $100 to all the way north of $10,000. There is a wide array of services out there for self-publishers to use. Some self-published authors have even spent over $50,000 across services, but these can include ghost writers and full fledged marketing initiatives. If you hybrid publish, then the cost depends on the hybrid publisher you choose and the fee you arrange for the services. If you publish traditionally, it costs nothing once they sign you, but to get noticed by a traditional publisher may cost you money and time. There is no right answer to this question.
This question depends on the nature of your printing needs and what sort of publishing avenue you are partaking in. Generally, if you are buying it through an offset printer and doing it high-volume it will drastically lower the price than if you print a few books at a time. This also varies because the cost changes based on the type and format of the book you are printing. Is it a children's book with color prints, is it a small book, or is it a large book? How many pages is the book you are hoping to print and what is the design of the book?
This depends on the way you are shipping it. If you are doing snail mail (media mail at USPS) you can ship your average size fiction book in a padded envelope for about $4. If you are selling online through a website portal most places have a shipping option built in. You use a base price to formulate it and charge your customers. You can always raise your book price a bit, and ship without the cost of shipping, but this will take away from your royalties.
That question can be answered with another question. How much do you got? You laugh, but it’s the truth, you can spend everything you have and then some to market a book. It can range from $100 a month to $100,000 a month depending on the size of the company or person doing the marketing for the book.