Biual/bicurious? i need help !?

okay, so im kinda curious about girls, and i guess i'd be lying if i said i wasn't. but it seems that the girls that i seem to like are always heavily only into guys. the woman i've got my sights set on at the moment is a lot older than me and seeing as i barely know her i can't say for sure which way she goes. any idea's on how to find out without openly asking and inevitably embarring myself? or how can i flirt subtly that might make her consider me differently? this is all new territory to me and any advice would be much appreciated. :) thankss.