First kiss? Urgent please read and help?

I was at the mall yesterday. I just met this guy and I was with my best friend. She was pressuring me to have my first kiss. So anyway the guy I had just met put his arms around me, I did the same and he just started kissing me. I kept my eyes open idk why I was just surprised. It was my first kiss, and I was kind of expecting it would be with someone I really liked. Then before me and my friend left the mall, I gave him a hug andhe kissed me again. Has this happened with anyone? And if so, how did you handle it? Plus, can you tell me how to kiss really well? And also how you know if someones a good kisser?