Photos of people can only be sold for commercial use if they've signed a 'model release' that gives you permission to use their image (children need a parent/guardian to sign). Without a release, these photos can still be sold for editorial use, as long as they were taken in a public place – eg, if you submitted a 'breaking news' shot with people in the background. If there's any doubt, always ask permission.
Some scams might involve asking you to pay for a “training” book or CD that explains how to make money in a certain business. Others charge for supposedly “exclusive” products that you’re supposed to sell at a premium. Avoid both of these scenarios. Remember, you should never have to pay to get a job. And if someone asks you to, you can be sure that it’s a scam.
Perhaps you’re raising kids and you’re committed to not using daycare. Maybe you’re a little older and can’t commit to a full-time job. Or you might be injured or disabled, making it difficult for you to leave your home each day. Whatever your reason is, if you’re stuck at home most of the day, you’ve probably thought about the income you could be making by taking a work-from-home job or running your own business.