In three years you will be able to dance if you work very hard. It's quite unrealistic to expect that you can learn to dance without lessons from a real teacher. In particular you cannot learn from video's. Video's are useful if you can already dance, but even then it's difficult. Nor can you learn to dance from a dance script.
Scripts are for people who already have a training in dance.
Scripts are a shorthand for what you need to do. To understand that shorthand you need several years of dance experience. Your Suggestions for New Zealand Dances Are Welcome.