Haha, I had almost the same experience with my first LD. I was running through a super-market when I realized I was dreaming. I was so excited, so I started running even faster. Then I looked down one aisle and this really creepy girl was standing in the middle of it, which shocked me and caused me to wake up.
As for lengthening the experience, check out this
stabilization guide. It's really helpful for, well, stabilizing yourself once you're lucid.
Also, don't worry about asking questions. No one learns without first asking questions.
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