5paragraph argumentative essay on marijuana? i'm not good at writing.

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Introduce it in the 1st paragraph  but make it sweet and short either for or against it , but with persuasion

if your for it : 
2nd paragraph : pro
3rd paragraph :  another major pro
4th paragraph : the point of view from a source that also agree
5th paragraph : Sum it all up with no more than one sentence for each topic you've talked about in your 2nd , 3rd, & 4th paragraphs , finishing with a summary sentence what you think it'll result for the future to come following your opinion about marijuana

Against it :
2nd paragraph : con's
3rd paragraph : another major con
4th paragraph : factual sourced evidence on how it was an overall con for that person
5th paragraph : Sum it all up with no more than one sentence for each topic you've talked about in your 2nd , 3rd, & 4th paragraphs , finishing with a summary sentence what you think it'll result for the future to come following your opinion about marijuana

HOPE I HELPED!!! ;-)