I just started any tips
You should talk to either your mum or elder sister about it, so that they can let you know how to cope with it. Also, make sure that you have enough sanitary pads/tampons with you so that the blood doesn't mess your clothes up. Read more from http://womenshealth.about.com/cs/menstruation/a/yourfirstperiod.htm and http://www.kidzworld.com/article/816-getting-your-first-period.
First you are really pretty and ask a lot of questions i like to answer them especially questions a pretty girl ask how old are you
Be yourself :)