Serving with the correct grip is essential to developing a great serve. Starting with the correct grip can give you a foundation to help develop others parts of your serve. For tips on other ways to improve your serve check out these videos: http://bit.ly/2dMD1Im
When learning the continental grip you will struggle with getting the pro-nation timed and you may spray balls for a bit. That’s OK, this is all part of the learning curve and if you give up you will never be able to develop the serve to the extent that you would like.