Im 15 and may have Manic depression, what to do?

Ive been researching the symptoms, and have shown all of them... My father and I have just had a conversation, and apparently it runs in my family, now that I know it may be a possibillity, I dont know what to do next.. At all I dont know how im supposed to react to it, its like just giving my feeling a name, im so confused, what is the next step? Treatment? Or is just knowing I have it enough to be able to see when it effects me and handle it, also if you could give ne a little more information about it, it would be greatly appreciated, Thank you for your time,