GIVE ME RELATIONSHIP ADVICES PLS

k so i kinda just asked my friend out, impulsively. i dont actually like her but the topic just came up in our conversation and i asked if she wanted to be my girlfriend, jokingly ofc, but she SAID YES AND NOW IDK WHAT TO DO BC I HAVE COMMITMENT ISSUES AND I ONLY SEE HER AS A FRIEND AND THIS IS ALSO MY FIRST RELATIONSHIP SO IDK IF I SHOULD CONTINUE IT FOR A WHILE OR TELL HER TO STOP.
she probably knows i dont actually have feelings for her but then again she flirts with me a lot so maybe she likes me??????
overall shes a nice girl so i do wanna try it out with her, so i just really need relationship advices, like how often should i text her, what do we talk about, do we have to facetime, what can we do on dates? basically anything u can come out with because i really dont know what to do and im just really awkward. thank u so much.
PS: im a girl!!!