If you want to sell products online, you may can it by creating your own website. As there's lot of competition and several existing websites in place already catering to this market, an attempt to create a niche in terms of products may be considered. Or, you can use the platform such as Amazon, Flipkart to sell. One can increase reach and visibility through affiliate marketing.
One of the cool things about Google AdSense is that it's so easy to get set up. If you have a blog or website, you can sign up for a free Google AdSense Account. From there, Google will give you a unique code that you will paste onto your website. Google takes it from there, tracking your page views, traffic, and earnings on your behalf. There is no upkeep or maintenance to get this thing going, which makes it a no-brainer if you have a website already.