Products with proven demand can be done a couple of ways.
1) Look at Clickbank.com Find a product similar to the one you want to create and look at the gravity. It represents affiliate
sales over a period of time. If it is large then you have a winner.
2) Look at amazon best seller lists. If people are buying books about the subject there is demand.
3) Magazine lists – Direct mail lists of people that subscribe to different magazineshttp://www.dietrich-direct.com/Specialty-Mailing-Lists.htmhttp://mediafinder.com/ Not cheap but can provide a ton of resources including places to advertise in print for your productshttp://lists.the-dma.org/ (look for different words to describe your target audience)
4) Keyword research Google’s keyword tool
http://www.43things.com/ idea research – THings people are looking to improve on
To find your market online you need to look for forums or newsletters that they subscribe to.
For example speakers who sell for profit
http://realworldseminars.com/ a list of seminars that speakers are participating atSpeakers Bureau Search on GoogleProfessional Speakers forum search
Using the language they use will help you narrow it down.
When you find a search that gives you some good information, click on More on the left hand column. Find wonder wheel and use it to
dig down into the subject.
If you aren’t familiar with Boolean search language let me know. I can send you to a guide on how to best use the advanced parts of
Google.