Taking on money-making jobs as a young teenager can build traits of responsibility and foresight that will be useful in coming years. Fourteen-year-olds shouldn't take on work that is so intense or time-consuming that it interferes with school or with just being a kid, but making a bit of money can be exciting and useful for any teenager.
For teens who are fond of animals, pet sitting won't even seem like work. Taking care of someone else's animals builds self-confidence and teaches about animals' needs and traits. Walking dogs, house-sitting for vacationing pet owners or taking pets in at home for people who are away are all ways to make some money by caring for animals. Dog walking is another easy way to make money from pet owners, and it doesn't involve the same level of responsibility as caring for an animal over a period of days. A 14-year-old who enjoys being outside and getting exercise may thrive doing this kind of work.
Lawn care is an old standby for cash-strapped teenagers and works as well now as it did 50 years ago. Many homeowners are too busy to care for their own lawns or just don't like doing it and have the money to get out of it. A responsible teenager who is reliable and does a good job can build up a repeat clientele over a number of summers and make a substantial amount of money. Basic lawn mowing can lead to more advanced jobs such as garden care and landscaping.
For teenagers who prefer computers to the great outdoors, there are opportunities to make money on the Internet. One of the easier ways is to get paid to fill out online surveys. The pay for these is not terribly high, but if you do enough of them the money will add up. Some surveys require respondents to be 18 or older, so these will not work for a 14-year-old. Try to find companies that offer many different surveys, so that you can do them one after the other without spending a lot of time searching for them.
Professional house painters are often looking for summer help, as it is their busiest season. An apprentice house painter can begin with some of the less pleasant jobs, such as scraping old paint, and move up to being a professional painter as he learns the ropes.