You can create a hypothetical website on one of the many topics offered. Then choose the hosting method, the promotion options, the ad layout and some other parameters. After your site is ready, you can sit back and watch how your site is making money. You can also change the various parameters to see the impact on the income potential.
This will give you a good insight of how your income can depend on different factors related to your money-making site. Naturally nothing is guaranteed as this is a simulation game only 😉