I know about PPC, I will make out you, Open your adword account.Select only those keyword which you think where your product can be sell. And then select Region The product you have World wide, Or specific country. Then Go on Review Forecast Of adword. There you will see two options
Enter a bid
Enter daily budget
1:The Bid you will you choose you to pay money when you ad get clicked.
2: Enter a daily budget, Whatever your amount you have you can adjust how long time you want to run your ad on Google.