If you're planning to do a dual-boot machine, definitely install Windows first and Linux second
you'll spare time and effort..
ATI has a nice graphical installer (for fglrx drivers, anyway) these days. Not saying it works (I myself got a "powersaving mode" always on after using the installer) but it's good looking.
Wireless drivers depend on the hardware..if you find native drivers, go ahead and follow the installation instructions that come with the pack. If you're totally unable to locate such drivers, tried writing your own and basically forced to commit a suicide, then get ndiswrapper and Windows drivers. Or maybe you'll want a second try before that.
Oh, and you only want to compile a custom kernel if something does not work and you'll not be able to breathe without it. Compiling a kernel is an easy go, yes, but it's no use unless the running stock kernel just won't satisfy your needs. With the machine power we nowadays have (and taking a brief look at your specs), it's needless to recompile a kernel just to get it smaller or something..especially if that's not a machine you're modelling nuclear weapons with, but your own personal computer. Just use the stock kernel, and updating it (and drivers) is less a pain.
