You really need to find a beginners class in your area. The nuances ,sublties , and style, are best served with a competant teacher .
You need to research the style most commonly danced in your area;try them all at basic level, and then make your choice .
Videos are teaching tools for those who have a " grasp " of concepts .
Salsas music may be very confusing to the beginner,and WHAT they use in class, can vary from area to area .
Which part of the world do you live ?