Re: "I managed one on one with girl I'm interested in. Not sure what to do next.
You need to give her IOD's coupled with IOI's in order to create Push Pull. Also, you need to do some things to disqualify her. That way she will be unsure of where she stands with you. That will definitely create more interest on her part and help keep you out of the friend zone. One way to do that is to drop her in the friend zone first. I would say something like
"You are such a great friend for being my partner." or
"I might have to hire you to be my house cleaner if you do a good job on our lab/project."
Acting like you would hire a girl for a job she would never do is also a disqualifier. Of course say these things with a smile so that the girl knows that you are joking. Even if she knows you are joking, it will still cause her to second guess herself and start making her consider chasing you.
You want to couple good behavior with IOI's and bad behavior with IOD's. If she shows you interest then you should show her a little as well. If she hits you with a neg, you have to be able to give her Sh1t back.
There is no such thing as rejection, only feedback.
Be the flame, not the moth.