How do I ask her out?

Ok, today had started out like any other day at school until finally a new girl had walked into my homeroom. She looks very good but all I really know about her so far is her name. I want to get to know her better but im not sure how, because every time I am my regular self girls tend to think im weird because I come on strong. So if you could please tell me how this could be done in laymans terms because I sure as h*** don't know it.