If you have a question about creating speed this is a good place to start!  

1) There' speed training and Force Application Training and both can help you develop more speed.

2) Conditioning can help with creating more speed.

3) Using internal Kinetics to apply forces into the ground can create more speed.

4) Is it clubhead speed you need to improve or Ball Speed?  Many golfers have sufficient clubhead speed but low smash factors and therefore low ball speed for the given clubhead speed.  I prefer to help golfers improve the smash and smash factor first. And often they find they don't need more clubhead speed.