Welcome to Slackware linux!
For the network card, it probably is already set up. To check, open up a terminal/konsole and type "su" and then enter the root/administrator password. This way you become the root user. Then type "ifconfig". You should see two or three listings of network interfaces. Usually your ethernet card is called eth0. If it is not listed there, try to bring it up with "ifconfig eth0 up". If you can see it now, look to see if there is an ip address listed. If not, request one with "dhcpcd eth0".
For the mouse, you can edit the file /etc/X11/xorg.conf. Insert the following in the InputDevice Section:
Code:
Section "InputDevice"
Identifier "USBMouse"
Driver "mouse"
Option "Device" "/dev/input/mice"
Option "Protocol" "IMPS/2"
Option "Emulate3Buttons" "off"
Option "ZAxisMapping" "4 5"
EndSection
and in the server layout section add the line:
Code:
InputDevice "USBMouse" "SendCoreEvents"
Then both usb and touchpad should work.
On the graphics question, try the "nv" driver packaged with X. Look in the graphics device section of the xorg.conf file and you will see where the Device set up is. Try to figure it out, and if you can't, post another question.
Brian