How can i start conversation with a girl that i like?

How can I start conversation with a girl hat I like but totally ignorant if she likes me???

Just start talking to her about anything. Ask her what she likes to do for fun or what her favorite color is. If she seems interested enough to talk, its worth a shot. If you feel comfortable, tell her how you feel and ask her what she thinks about you. Good luck, I know its hard to tell the one you like how you feel, but you never know until you try.