help with 3d scroller skateboard chase script

Hello as you should know I am making a game for the ps3 & ps4 and at the starting of story mode I will have an epic skateboard chase scene I will also have an alien chase you on a hovercraft and you have to dodge obstacles such as fences trees cars rivers if you get caught inside them the alien will erase your memory and put you as a hostage not as gory as it seems because I want this game to be for the whole family to watch so ready for the question I need help making scripts for all these because I have no clue how to script and it has to be a Java script because my computer for some stupid reason wont let me take C# scripts