Hi,
Unfortunately we don't have any video tutorials at this time, but the FAQs and forums should have most of what you need to get started. Usage of Jav-It is the same across all platforms, with the exception of small OS differences. In most cases, if you look up how to use the command-line for your OS, you should be ok. I will mention that Jav-It is built for MacOS Darwin (x86) and not the new M1 CPUs, so if your mac uses M1, then you'll need to make alternate arrangments for Jav-It.