Take it seriously. Yes, you’re applying for an online job. Yes, you can do the work in your underwear, but that doesn’t mean it’s not a “real job”. You must treat it as such or they aren’t going to treat you as a serious candidate. You aren’t the only one who wants to work in their underwear. In fact, the competition online is likely higher than it is in your local area.
Sell unwanted items. You can also sell items on Amazon or eBay. These might be objects you or your parents have but don’t need (such as books you have already read). You can also make a lot of money selling vintage items online through these websites. You can often find cool vintage items at yard sales or second-hand stores such as Goodwill. Ask your mom or dad if they have some free time one Saturday to help you hunt for vintage finds in your area.
In your parent's day, the only way to make a living drawing comics was to get your comics into the newspaper or work for DC and Marvel. Today, you can draw comics about anything you want and start your own site to host them with a little money borrowed from mom and dad. Selling t-shirts and space for advertisers is a great way to earn a little money with your own comic.