You will want to download one of the scripter programs. These allow you to load up a video create a script and save it.
I have more familiarity with the joyfunscripter (available here: How to get started with scripting), but there is the openfunscripter (available here: OpenFunscripter - another scripting tool - 1.1.9 release - #333 by sentinel)
Scripting isn’t really difficult, but like any skill it requires practice so that you can do it quicker and make better decisions.
As noted above, scripting a cock hero video (assuming it has a beat meter) is about as easy as it gets (without a beat meter poses new challenges).
The guide for the JFscripter is intimidating as hell, but to get started on a cock hero script is actually pretty simple. I would recommend deciding on one of the scripters, installing it, playing around with it for a bit, and then return here with any questions you might have.