Help .. my new friend (who is a girl) and i am to , please help?

i really have something for this girl,and i liked this girl for a lil minute but i didn't say nothing cause she had a girlfriend but now she know and i said we were taking baby steps and she said why do i think that so i told her why and now she want ME to take it up a notch but im not sure what she mean by that, so im looking for a response to tell her . please help, plus im a little shy so but help