The basics of using Adwords to make money are very simple. You basically buy clicks on some keywords that people search. The visitor will then see one of your sites where you sell a product or a service. It is also possible to promote an affiliate marketing based product. In this case you would gain a commission on every sale brought in.
The problem with making money with Adwords appears in ROI. You have to make sure that you make more profit from sales of services and products when compared with what you invest. In order to do that it is necessary to properly analyze the market and test everything with small investments before fin finding your own, personal recipe for success.