We have already covered in depth what Pay Per Click is at this site, and why you should consider it as part of your overall marketing strategy.
When you begin, it is imperative that you choose effective keywords for your ad campaign.
Good keywords are critical to the success of your ad. Choose the right keywords and you choose the right audience for your ad. Choose the wrong ones, and you will be paying for traffic, but not converting that traffic.
The right keywords will help you connect with the most potential TARGETTED customers, which in turn should help you earn more sales, and get the best return for your advertising investment.
You choose keywords for your ad when you first create your account with Google. You can also add new keywords or edit and remove existing ones after your account has been set up.
Before we get started on keyword selection, make sure you do NOT select the Starter Edition as Google calls it. You may be tempted by speed and ease, but seriously, better to start out small, with very tightly focused, well-organized PPC campaigns in a properly set up account, than watch your money vanish and literally have no clue where it all went. Even if $20 a day sounds like a small amount of money for PPC, that is $600 a month, $6000 a year, so you want to get the most bang for your buck.