Hi, I agree with what everyone said in the earlier posts regarding niche marketing.
Regarding how to promote it, you're already in there. Your college, every college, they all have regular newsletters, notice boards, etc. But remember there are students of all ages, there are mothers, there are seniors.
Also you don't have to just create one book. If your information is valuable you can expand it into a home study course (this is what your target does anyway, studies), there are tapes and there are videos.
Have fun with it and by all means give it a go. They say 80% of marketing attempts fail so if you get 20% right you're doing well.
At least you're giving it a go.
Good Luck and well done.
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