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I have to be honest: I've never really charged for this. I've done it for many of my own sites, and for some non-profits whom I didn't charge, and I've always given out advice to friends and family, etc. But it's all been free.
They would like to know how much per page I would want, and I have no idea how much to charge for the manual. Any advice would be appreciated. I've got about 2 years of experience doing this.
Obviously you would likely not charge as much as someone who does it for a living, however you can try looking at their prices for a guide of the top of the range, then if you think you are half as good as them, charge half :-D
One simple answer to that question is, how much are they willing to pay? if they want to pay you a lot then charge them a lot, if they aren't willing to pay much then dont try and charge them too much and put them off of the idea.