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Publishers can do all of the things you identified in your list for you, but the degree of commitment that they apply to each will vary based on a number of factors. If they believe that you have a...
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Source: https://writers.stackexchange.com/a/5875 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Publishers can do all of the things you identified in your list for you, but the degree of commitment that they apply to each will vary based on a number of factors. If they believe that you have a truly commercial product that has the potential to reach a very large fan base, they will devote more time and resources towards making your book successful. The problem here is in getting them to agree to publish your book in the first place. Since you indicate that your book is targeting a smaller niche market, your best chances of getting picked up by a publisher would be for you to find one that specializes in your type of product. Failing that, you're facing a very difficult road. It sounds like you already have a plan/idea in place for pursuing self-publication, which is most likely a more viable option for you. There are a number of advanatages that have been discussed in other posts, but it will also require a lot more effort on your part. In spite of that, you probably have a better feel for your intended audience than a major publisher would have, so you would probably have better success pursuing this on your own.