Okay so I need help. Ive started working with a really cute girl

You could ask her on messanger

I think this is impossible for you since you are already asking on 4chan, but you have to just act like a normal person and talk and get to know her. Once you've proven you are not a spaz lord and you may then ask her out on some kind of date. This should take a week or two tops.

I'd only message her if you're continuing a conversation that you had in person. Like making specific arrangements after making plans like her address if you're picking her up, where to meet, what time, if she's there yet, etc. I wouldn't try to do most of your talking on messenger or actually ask her out on there. It's very beta.