Start by making a list of products you like and know something about, and that you think there is a reasonable demand for. Recommending and selling products you believe in is always a lot easier.

Then do a search for those products in your defined market area and rank them in reverse order for how many sources there already are for those products.

Finally, choose the top (i.e., bottom) item or the top 3-5 items and start trying to sell those.
I second the idea that you should find something that you like and know a bit about.

Google around, and see if you can find a niche that you would personally be interested in that isn't being served, or not served as well as it could be. Then once you figure that out you can do some further research using Google Trends, etc.
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