i need advice immediately !!!

There is this girl from college, i really like her ...
So i want to make something more with her than a one night stand ...
Can you guys tell me something romantic thing to do to her ?
I dont know her personaly, only we said twice hello... But i can say that there is something between us...
Can you give me some opinions?...
I was thinking to put a rose on her door where she lives ... SECRET ADMIRER STYLE :))) what do you think ?

Sounds like a good plan but I think it is also nice to make friends with her. Through this, you will be able to know her better and find out if she is really worth your time and effort.