There are few ways to make money while you shop. You can pick up short tasks that involve shopping, like doing price checks or photographing in stores or you can go mystery shopping. Mystery shopping is definitely a real way to make money but you have to be careful because the jobs can be the bait for scams, so you have to know the signs of mystery shopping scams. But there are legitimate companies that hire mystery shoppers.
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The topic you choose must have enough depth that you can create a lot of content for it. This is important for building an authoritative site, for search engine optimization, and most importantly, for the end user. If you don't have enough content about a topic, you're not going to be taken very seriously as an authority on the topic and it's unlikely you can convince someone to make a purchase from you.