Grow plants, herbs, or vegetables to sell if you have a green thumb. If your parents let you plant your own garden in the backyard, opt for easy-to-grow vegetables like lettuce, tomatoes, or cucumbers. If you will be growing your plants inside in pots, choose ones that don’t require a lot of sunlight or space. Pick your vegetables when they’re ripe and sell them in bags or plastic containers.
Find a profitable niche. Starting with your interests, write down as many niche ideas as you can. Think about topics people might search online. Ideas include passions (like surfing or body building), fears (like spiders or speaking in front of crowds) and problems (like getting out of debt). Do keyword research to see it others are interested in the topic. Find out if a domain name is available that matches the keyword 100 percent. 
26. Services – You can offer a paid service, such as life coaching, blog coaching, goal setting or financial planning. Just be sure to investigate all the legal implications and make sure you’re not claiming to be a professional if you’re not one. With a service like this, you’re basically using your blog to sell yourself. You’ll need to convince people that you’re worth buying and then be able to back up your claims once they purchase your service.