I would reccommend firstly finding something that you are passioante about in the niche, like ppc, seo, autoresponders etc.

Once you find what you feel confident about try to get in the mind of the general market and find a gap. is there something that you are doing that could be automated? or something that is a little tricky that you could offer a manual for?

Creating your own product is a good way to get started in my mind hope all goes well for you.