There's an audience for everything, even if it's as specific as dollhouse furniture or organic dog food. With a niche e-commerce store, you can reach customers who seek your specific products. Building a business in a niche market can help you differentiate yourself from other brands and build your credibility and expertise. Look to social media or your own consumer needs to come up with a product to sell online.
Affiliate marketing can be broken down into different levels of involvement: unattached, related and involved. Unattached affiliate marketing is a basic pay-per-click affiliate marketing campaign that requires little to no involvement with the product you are promoting. Related affiliate marketing requires you to have some authority and content on the product you are marketing, but you don't personally use the product. Involved affiliate marketing is perhaps the most effective, as you'll be marketing an affiliate product that you actually use and enjoy.
Advertise! Whether you pay for advertising or you trade advertising with related websites and blogs, or you use free search sites, the important thing to remember is to put in the time and keep track of what works. Search out other websites and blogs with similar content and leave comments with your contact info. There are services that will do all the marketing for you for a fee, but to start out, you can do the marketing yourself. Fiverr.com will advertise your website starting at $5.