1. Choose a niche: You need to choose a niche that you are knowledgeable and passionate about. It can be anything from beauty products to tech gadgets.
2. Find an affiliate program: Look for companies that have affiliate programs in your chosen niche. You can use websites like ShareASale, Clickbank, and Amazon Associates to find affiliate programs.
3. Promote products: Once you have chosen a program, you can promote the products on your website or social media channels. You can write reviews or create videos demonstrating the products.
4. Drive traffic: To earn commissions, you need to drive traffic to your affiliate links. You can do this by using SEO, paid ads, or social media marketing.
5. Monitor and optimize: Keep track of your affiliate marketing efforts and analyze which products and promotions are working best. Optimize your strategy accordingly to increase your earnings.

Assuming you earn a 10% commission on each sale and the products you promote have an average price of $50, you will need to make four sales to earn $200. However, the amount of time and effort required to achieve this will vary depending on your niche, target audience, and marketing strategy.