Blogs are a great way to begin making money online. They are hard work, and they don't pay that much (at least they don't from the start, however if your blog makes it, they can make a lot of money), but they teach you a lot about the intraweb. I highly suggest a blog on a topic that you like.
Don't get into the web game just because you want to make money. Have fun doing it. Judging by your avatar, you look young. If you want to make money, go get a part time job and do web projects on the side for the fun of it. You can worry about making money later, just have fun now. And if you're lucky, you'll be making money while having fun