How to build up a relationship?

So there is a girl i like from taekwondo club we had a decent day together in competition and chatting for 2 hours. what is my next steps? . and how to not ruin our relationship? also i am not working right now cause i don't need it. will i need one to have a decent relationship with her? Ps. I am a student and quite busy for jobs

How to build up a relationship?
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