Your first paragraph needs to state what your persuading them into doing. The second paragraph needs to state a reason why they shouldnt buy a hover board, the third one should be the same thing , a reason as to why they shouldnt buy it. The fourth one needs to explain why your reasons in paragraph two and three are legit reasons to not buy a hover board. The fifth paragraph needs to be evidence for your reasons why not to buy a hover board. Finally in the sixth paragraph just summarize everything you have wrote.