Great 5-step instruction in this video. The ‘chopper’ grip is the same thing as the continental grip in case you are not familiar with the chopper term.
By the way, continental grip may be the general rule of thumb but it’s fine to use an eastern backhand grip or even eastern forehand grip. It’s all about what works for you and what you are trying to do with the serve. But for keeping it simple and sticking to the basics, continental is the way to go.