Ambling should be legalized in all states
Only 5 paragraphs neccesary. Intro para. must have thesis in the last sentence and thesis must be used as an essay map where each item is a topic sentence, for example: Gambling should be legalized because it will lower taxes, create jobs at casinos and provide funding for the eduacation system. Those three items are your topic sentences.
The first and/or seecond body papragraph/s is the opposition, explaining what other might say as far as not legalizing gambling.