Where can I get the software that installs google apps for CyanogenMod
You can check with the corresponding Wiki page at the CyanogenMod website to find the correct version of the GApps zip file.

Once downloaded, place it into the root of your SDCard, then reboot your device into (custom) recovery. From there, chose "install zip from sdcard", and select the file you've just downloaded. That should install GApps on your device.