I dont know, I just have the urge to start one. It what be a blog about high school life and how hard it is being a teenage girl living in the city. It would have a unique layout and a really cool link.
To start your own blog is a wonderful idea and awesome experience. If you don't know where to start from, go for a ready-made wordpress blog theme?and edit it according to your needs. Btw, sooner or later blogging will bring you money. Good luck!