Thanks for posting on the forum. I suggest you start with a simple model and compare the input files between Velodyne and LS-DYNA to see how different the format between the two is. You will also need to check Velodyne's manual for the available element formulations.
For getting familiar with LS-DYNA, there is a great selection of examples here:
The LS-DYNA manuals are located here:
Let us know if you have any questions.