Here's a good starting point for the Broadcom driver (apparently the Broadcom STA driver works for that device):
http://wiki.archlinux.org/index.php/Broadcom_BCM4312
For the nVidia card, the opensource `nv` driver should work, but if you want the high-performance driver, this is the nvidia linux driver portal:
http://www.nvidia.com/object/unix.html
From the looks of things, the latest 190.x series driver supports your card, but you'll want to maybe google around a bit to make sure, or select the (190.x) driver link on that nvidia page, and either read the "SUPPORTED" tab, or the README file on the driver download page.
Also note: if your distro offers the nvidia binary driver from your package manager repo, you may find that to be easier than installing the driver from source, as is provided from nvidia.