Well, if it helps any, if you're self-publishing, they aren't actually "royalties". That's the word Amazon uses, but real royalties are a passive income sort of thing. What you're doing is running a small business, selling a product. It happens to be books. Your delivery mechanism (Amazon) takes a cut for their distribution and you receive the rest, just like if you were selling light up Halloween socks or something.
So, what I'd suggest you really need is someone who understands a self-employed small business.
So, what I'd suggest you really need is someone who understands a self-employed small business.