You are at a pivotal point in your life. You may not realize it, but your mindset is great. Most kids your age are thrilled to get an under appreciated job working for some company to make a little spending cash. However, those who look to get into the business side early in life are usually the ones who become successful. What you do now, might not make you a rich kid, but you will pick up much more valuable experience that you can cash in, down the road.
I would suggest you learn to make websites right away. It is a valuable tool that you will benefit from. You make a little cash making websites - the more experienced you get, the more money you can make. You don't need too much money to get started - seeing as you already have access to a computer. Making a website will get you thinking about business in general and it will lead to marketing, finance, and profit.