If windows ISN"T showing in grub. You need to su to root and run the command:
Debian has a slightly stricter stance on proprietary software than Ubuntu. You need to add "contrib nonfree" to the end of your sources in your souces.list
Here's a good link that educated me on a few things when i first used Debian. Thanks to caravel showing me this.
For audio you may have to open alsamixer and unmute your soundcards.
I don't know about your wireless but you may have to enable the appropriate repo and install the required packages. I had to do that on Debian too.