Hi,
I think I can help you.
In my opinion a website would not help you unless you listed your manuscripts on one with good traffic, but I think that would be expensive.
I think Facebook advertising is the way to go for you.
I can provide a high degree of targeting for ads, only putting them in front of people who actually have an interest in what you are selling.
By doing this I can get the cost down to a few cents per click.
There is a high response rate too, because everyone who sees your ad has an interest in the topic.
I can provide you with the targeted data, or I can do the ads for you if you want.
I charge $150 for 2000 targeted Facebook users.
I estimate there could be over 50,000 users in the niche and related niches. There could be more. I have only had a brief look into it.
You would not have to advertise to them all, I think. I would try 2000 first to see how it goes.
Please let me know if you are interested in this idea.
Regards,
Stu Pearson.