I recommend you write an ebook about your niche. If you do not have the knowledge or expertise to write an ebook, then you will be much more able to run a successful website in that niche if you get that knowledge or expertise.

You probably want your ebook to be helpful, informative or entertaining. Of course, you can make it all three.

You can write your ebook in a word processor and then convert it to PDF format.

What do you think?