Buy O'Reilly's book "Learning Perl on Win32". ActivePerl doesn't really make a distinction between WinNT and Win2000, as both are Win32 systems. Nearly all the modules written for Windows are Win32 modules, meant to be used on both Win2000 and WinNT, as well as Win98 and WinXP (I think).
Once you've mastered a few things, I'd purchase Programming Perl and Advanced Perl Programming, if you plan on programming Perl seriously. Otherwise, the first book is plenty.
Also, don't be afraid to ask any questions you have here. We don't bite (much). (I'd use Seekers of Perl Wisdom instead of Discussion. The latter is for discussion of PerlMonks itself.)
Good luck, and Welcome! :)
/me wants to be the brightest bulb in the chandelier!