ok, sorry that you don't seem to have an adult around for this. It probably is your period comming. It all sounds like the signs of it .If you can go get you some panty liners are some "always" pads small ones. Maybe get some motrin
or what ever works 4 you keep it with. I would NOT use tampons until later ater you have had some cycles.There isn't any thing to be scared of cuz there is nothing bad about it except it aint fun. It should last around 4 days then in about 28 days it will happen again every month after. You know can get pregnant so be safe...If you need anything your school nurse will help its her job to these things so dont be afraid to ask. As for the discharge uh dont know again if you cant go your parents then go to the school nurse. here are a few sites maybe they will help.