How do I use a template for a film or TV script or just a [Blank] and just the template as a building block for writing a script?
My first time using the software and this was more the cheaper alternative than Final Draft which is a subscription and [not a own than it yours as Scrivener].
Please do not post the same, or very similar question, multiple times to different areas of the forum.
I am not entirely sure how your question relates to Markdown. The closest thing to Markdown in this domain is Fountain. Scrivener has support for Fountain on import and export, but does not really have anything by way of support for writing in Scrivener using Fountain formatting. You can certainly do it, as with Markdown it is a format designed to be used anywhere you can type, it requires no special technology. But Scrivener’s support of this format is to interpret the formatting into its own scriptwriting system, and upon export to take the results of that and turn it back into a Fountain text file.
As for your more general, non-Markdown related questions about templates, I couldn’t really say. These are personal choices. I would imagine most people start with one of the scriptwriting templates that matches what they need to write a script for, though. If you are new to the software, that is not a bad way to go as you would have to learn a lot to replicate all of what it does, into Blank. More experienced users do tend to start from Blank though (or their own templates they have created), because they know what they want to do, and how to set things up, and don’t want to have to waste time undoing the assumptions made in our example templates every time they start a new writing project. Hopefully that all demonstrates how this is a matter of personal preference. Nobody is going to be able tell you whether you should do this or that.
I would refer to you also to the interactive tutorial in the help menu, to learn the basics of using Scrivener. Also at the top of the menu is a command to load the user manual. If you are curious about templates, for example, in the chapter about projects (Chapter 5), you will find a subsection devoted to using templates, creating your own, and so forth. If you are curious about scriptwriting, go to Chapter 19. The further you get into the manual though, the more it is going to assume you know the basics as described in Chapter 4, and in the interactive tutorial.