Can I use Quest to start, say, my batch windows files?

I think there are tutorials for system commands.

As far as I know, no, you cannot start with a batch windows file... whatever that is.

No.

Too bad...
But then again, Quest is not a program language, it is a text based adventure writer program...

To do what you want, you would need a true programming language...
Basic would be the easiest to learn and can be found for free.
And several of the commands are the same as Quest... just different.
qBasic is DOS based textual one. (And free)