The problem with affiliate marketing, like many other home business options, are the so-called gurus and get-rich-quick programs that suggest affiliate marketing can be done fast and with little effort. Odds are you've read claims of affiliate marketing programs that say you can make hundreds of thousands of dollars a month doing almost nothing ("Three clicks to rich!"). Or, they suggest you can set up your affiliate site, and then forget it, except to check your bank deposits.
The Commissions Report table gives you information about your sales. You can see on what date they were created what type of plan was purchased, and the campaign from which the sale has originated. If you only refer clients with your affiliate link directly without using campaigns, you will see that in the column "default". The last 2 columns show what the status of a sale is and what commission you can expect for it.
The answer, at its basis, is largely what I convey in a great majority of my books about search engine optimization and online marketing. It all boils down to one simple concept: add tremendous amounts of value to the world. The more value you add, the more successful you become. Essentially, you have to do the most amount of work (initially at least) for the least return. Not the other way around.