I have been going to google tools and using a competitive keyword than doing a search for all other keywords that are related. Than you can pick and choose through the list and see which ones were used the most for the previous month. Not sure if this is right or not but that's what I am doing.
https://adwords.google.com/select/KeywordToolExternal Try that and see if it helps.
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Hit my first goal ....now just need to push it a little bit further 
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