Pay per click - Questions - Please help

Pay per click - Questions for a consumer site - Please help

I am new to this...and clueless!


1. I am trying to find out how much it costs for different keywords
(pay per click ads).

I went to Google, but could not find out what it costs. Does one have
to register with Google being getting this info

I would like to find out the costs in MSN, Yahoo etc..if they have pay
per cick


2. Also wanted to find out how many people have keyed in certain
keywords in a month at each site.

3. Any statistics on how many (percentage of) people typically who type
in certain keywords click on the ad on the side ?


Any help would be highly appreciated.

Thank you very much.

Linda