The advice I give you is to test it. Join google adwords and try it out.
The reports will give you all the details you need as far as CTR, Converstion Rate, and avg. CPC
The CTR is depended on how good your ad is and also how much competition is on the keyword you are targeting. My suggestion is to use longer keywords and put the keyword phrase in [].
The conversion rate usually is depended on the landing page as well as how easy to use, and how trustworthy your site is.
Hope this helps!
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