Are you looking for a keyword research tool? Or do you want us to give you tips on products for promotion?

Anyway, if you are after keyword research tools, then I recommend a few of them: Google Keyword Tool, Wordtracker (trial), Traffic Travis (trial version) and SEOBook.

Who is your target audience? I hope you aren't going into the "make money online" niche as it is a bad niche for most newbies.

Google Keyword Tool is best tool to research keyword..

I would suggest using Ubersuggest. It's 100% free and easy to use

google adwords got a pretty good one

If you are a beginner, use the Google Keyword Tool.
Make sure you tag 'exact' in the search options.

Have fun!

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hi
i recommend try manual search, choose the keyword with high search result and low competition.

Google adwords is the best and free tool for the keyword research. But manually creation of keyword can be more helpful. As when google adwords show the results with the right keyword for your product then you will be little confused to select right keyword from them. So make observation for such words in your field that highly used by people for their search and use those words for your keyword. So this will be easy for you and you will get the best results also.