Only advertise products on your affiliate site you personally believe in. If you wouldn’t buy it, don’t advertise it. When your visitors find out that not even you believe in the products and services you promote, they will leave your site and will never come back or recommend it to other possible customers.
If you are just starting out as an affiliate marketer, you should attempt to keep your campaigns small by only going with one solid product. See if you have a knack for the game or not. If you begin to make commissions on products, then you can begin to expand your presence online. But keep it small to start.
Make sure you are receiving full credit for every order. You should be aware of what type of tracking software the affiliate company you are working with uses and know whether it is reliable and legitimate. If sales from your affiliate links are not probably tracked, you could be losing thousands of dollars in commissions.