Like anything else in this world, you'll either need a lot of time or a lot of money. If you have both, then clearly, you're ahead of the game. But most people have more of the former rather than the latter. But considering that time is finite and we only have a certain amount of it, using your time wisely and managing your time properly is crucial to ensure your success.
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.