Google Adwords is a bid based form of advertising. You place a bid on every keyword in which you wish your advert to appear for. Then once someone clicks on your advert and a figure close to your bid is taken from a daily budget.
The exact figure, the exact Cost Per Click is also determined by a Quality Score which is given to each of your keywords. The scale is 0-10 and the higher end of the scale is gifted for a pathway of relevance from keyword through advert to landing page. In essence, the higher your Quality Score, the less you have to pay for your clicks.
Having appropriate landing pages and good website content is essential and we would require access to your websites administration portal to manage this.