When you are setting up adwords campaigns, it's very important to take the time to do it right. Adwords is a fairly unforgiving advertising method, if you don't know what you're doing and you don't set your campaigns up the right way you will spend a ton of money, and you won't make one red cent.
I would highly recommend that you find a course, or a mentor who can walk you through the complexities of pay per click (PPC) advertising before you just plunk down your money and hope for the best. This isn't Atlantic City.