What I can assume if you just made your campaign live with few keywords that doesn't bought any sale so far.
So what you should do is:
1. Check the ad. They are getting clicked by visitors mean, yes your ad is of someone's interest. Now check, why that someone is not converting?
2. Check out the list of keywords from which you received clicks. If you have used broad match then click on TAB "keywords" then from drop down select "Details" > all search terms. Here you will get the exact search terms that resulted in a click.
Now check by which keyword, you have received a click to which ad. Check out the relevancy.
For eg. keyword "Need a web designer" displayed your ad "Hire affordable web designer. Contact today for free consultation" then they must landed to your web page that should speak about your services about web designing with a contact form where in they reach you.
If this relevancy doesn't matched out. It means the campaign you had is not correct.
Get it corrected and go ahead with a new one.
Hope this helps.