I am very new to adsense, and was just wondering if there is any way at all to check the average values of clicks prior to deciding what topic you are going to run for your website? Any help would be appreciated....
i use the Firefox Adsense Notifier plug-in which gives me the average CPC. https://addons.mozilla.org/en-US/firefox/addon/500
If already have adsense units on your site so Adsense notifier is OK, or you can use Adsense Report feature on your Adsense Account Page. If you want to do some research on CPC for certain topics (or keywords) use Adwords Keyword Tools
those tools still not as good as you try it yourself. there are many case that people follow the high pay keywords and got not even 10% of what it said. so try and then change it later is fine to go.
https://adwords.google.com/select/KeywordToolExternal This is what I refer to check the value of keyword that I use In my blog to generate income.