Hi there. I used to repair computers when I was your age, but mostly fixed software problems on Macs. Nowadays, people have the apple store to fix their software issues. But I think the iPod idea's great! A third generation iPod battery is 15 bucks. If you have 50 dollars that you're willing to invest, you could definitely get one of these and replace someone's dead iPod battery. (But you should wait to figure out what iPod they have before buying a battery you can't use). Remember that there's still shipping and tax to consider, but you can easily charge 40-50 dollars to replace the battery. That covers the new battery and your labor. You do that two or three times and you've doubled your money. With iPods that old, they're usually out of warranty, so people either pay for a new one or do it themselves.

The problem with fixing macs and apple hardware is that people are likely to take their problems to the apple store before they trust someone else with their stuff. For that reason, you have to focus on things that are out of warranty, like dead batteries and broken screens. Also, hard drive / ram upgrades in MacBooks are easy-peasy and make a computer feel new again. Many MacBooks were sold with 1 GB of ram. In many cases, however, this is not enough to run word and a web browser simultaneously. 2 GB of ram is pretty cheap these days, and doing the installation can get you a good chunk of change. Feed your profits back into your business, and you can make a good chunk of change while helping others and preventing e-waste.