Not to discourage you, but your comment that you are "not very good with dos" gives me great concern about the likelihood of success in doing anything very interesting with Perl. (This observation is null and void where prohibited AND/OR where you are just using a windows box because it's available but are already expert with some other Operating System/Command Line Interface :-)

Much of what you're likely to want to do with Perl will be greatly facilitated by understanding your OS. I don't mean to suggest that you have to become a Kernel wizard or a guru on the internals of DOS or Windows (and by the way, since W2K, the Windows offers its CLI via cmd.exe... which has some semi-significant variance from command.com, the interface to the earlier DOS prompt).

But, IMO, in parallel with your early experimentation with perl, you will be very well served by making the effort to "get good" with your operating system, because the strengths of Perl become especially obvious when you learn how easily you can do jobs that would be difficult or impossible (for any given level of skill) from windows, itself.

That said, welcome to the Monastery... and fair winds on your quest.