Hello Dp's I want to know how to make a keyword study to start my business For example i want to know how many times the keyword searched a day and the volume of search results and want to know how to know the estimated cost for the cpc on google adsense to choose the right keyword plz could you tell me that if a free tool or payed tool Thank you Dp's Best Regards
Try http://www.google.com/sktool/ or https://adwords.google.com/o/Targeting/Explorer or http://freekeywords.wordtracker.com/
The most searchable words for your site should be keywords.google keyword tool (free) does all this .