Ineed to write an argumentative essay for a class but im not good at it. is there an easy way to do this?

Lol I don't think there is an easy way to get out of that, i had just did one about Ciggarette smoking and i got an 89% trust me you will do good, calm down and think. hope that helps! :)

In your Introduction, start it off with your opinion directly stated. Briefly give some reasons  or ideas why you agree with your argument. close the introduction restating your argument and add a question like if the topic was clean water your ending statement would be "do you want to drink dirty water".. you get me?
Start off the first paragraph with an explanation for one the brief reasons or ideas you gave in the intro. elaborate on one of the ideas and research your topic to have more evidence for your argument. Do the same thing for the other body paragraphs.
After you have your body paragraphs, make your conclusion. Restate why you support you argument, its basically the introduction but with " In conclusion, this is why i think that."and then restate the brief reasons. 
HOPE THIS HELPS! ;))