It's normal for women to start their periods as late as 16 years old. It's also normal to have abnormal cycles when u start having your period, so I'm not surprised it's really light and brown, not red.
If you have more questions, just talk to your mom/aunt/older sister - periods aren't so awkward to talk about as you think, especially for those of us who have been having them for years. It happens EVERY month - you'll be tired of it in no time. Good luck!
Well congratulations. It looks like you HAVE started your period. That brown stuff is just a tiny bit of blood that didn't make it's way out immediately. Don't worry, more will come later. It's not unusual for a period to start this way. Nothing to worry about.