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How much would you charge per page? And how much would you charge for the manual? Thank you in advance.
In this case it might be easier to just charge by the hour. Figure out what your time is worth and keep track of how much time you spend on their site and on the manual.
The SEO manual: I'd require some healthy pricing because instead of just doing some work for someone else, you are going to be selling some creative, intellectual property-type stuff when they buy the manual. You might do some research on what (and how) copywriters charge, and try to base the manual's cost on that.