You write down 5 positives and 1 or 2 negatives about your product or item that you are advertising then start off with a attention grabbing sentence. Usually a question. Then talk about your positives and then say your negatives but make them sound like they are funny or something like that. Then it will all flow form there. Other things you might like to talk about may be the cost, why you made or are selling your product, things like that