What state are you in? The first thing you should do is find out if you meet the minimum qualifications of the department or departments that you would like to work for. If you do, then you can apply. If it or they are big departments, they will probably have the information you need on their website. If you don't meet their minimum qualifications, then you have to try to do what you can to meet, or better yet, exceed them, and then apply. If you get hired by a big department, they will usually send you to the police academy. As far as education goes, you might need a high school diploma or GED, or you might need some college or even a college degree.