There are many variables that determine what you pay in Adwords, and most other ad networks for that matter. There is no site that will tell you here's what you'll be paying. The only way to find out is actually having a campaign.
Adwords can cost you 5 cents per day and it can you 5.000$ per day. It's up to you on much you want to spend. To find how much it can cost per click on a keyword, for your ads then make a test: Make a campaign, make an ad group, add keywords in the add group, make an ad text, set a cost per click (CPC) and let it run. After a few clicks you will get some idea. You can reduce the cost if you make afew variations of an ad. After many clicks on each, stop the the ads that cost more. THis will reduce the CPC of a keyword.
Are you adding about CPC (Cost per click) ? It depends on various things like the competition at the time of your campaign, who bids higher, who is investing min daily budget like wise numerous factors affect this.