Adwords and such programs..

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Has anyone tried adwords before to advertising a product your selling. I think it could be a great way for any company to get their name out there or to bring in sales. I got some hosting products for a new company i started up and we are thinking about using such products to sell our products. I'm wondering how much success someone has had without putting a lot of money in. I know you can how much you want per click something like 0.05$ If you have used such program what has been the clicks=sales rate. Does it take you 20 clicks to get a sale?