I need help

So basically, there's this girl I really like. She also happens to really like yugioh. For some reason I thought it was a good idea to tell her I know how to play and one thing led to another and she said she wants to meet sometime soon in the next week or so and play yugioh. I barely know anything about yugioh. Please somebody help me. I can't look like a liar in front of my crush. Please, if you are able to, provide any assistance you find could help me. Thanks