Angela....
Linux rocks... but if your just new to php,
you have enough on your plate.
One book I highly recommend for rookies
is: PHP Fast & Easy by Julie Meloni.
Check out her website:
http://www.thickbook.com/
Once you can make PHP do tricks, you could:
1) Set-up your windows box to dual-boot,
and play around with Linux.
2) If you have another old PC kicking around,
install Linux on that.
Anyway, have fun with php on Windows for
now, and when you want to tackle Linux,
shoot me a note... and I'll help you
release the penguins! ;-)
Cheers,
Steve