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Please help me to correct some grammatical mistakes, thank you!
One month ago, I and my friends visited a scenic spot. Suddenly, I found the trash can on fire! We pour our water into the trash can and opened it and saw a cigarette. Maybe someone threw the lit cigarette into the trash can. Well, I hope that won’t happen again!
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Hi,

One month ago, I and my friends were visiting a scenic spot. Suddenly, I found a trash can on fire! We poured our water into it, opened it and saw a cigarette. Maybe someone had thrown the lit cigarette into it. Well, I hope that won’t happen again!

Best wishes, Clive
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This isn't ungrammatical, but it's far more common to see "my friends and I" than "I and my friends." It's just a style thing, but it will strike many readers as unusual if you list yourself first.