Do you have a separate Windows partition on the same machine as Slack? If so it might be a good idea to be able to mount your windows partition so you can see it from Slack. That way you can download the drivers you need to get on line in windows and then drag and drop them onto your slack partition. If you make a folder /mnt/windows , add this line to /etc/fstab
/dev/hda1 /mnt/windows ntfs ,ro,umask=0 0 0
at least, thats if it's Windows XP (hence the ntfs) and it's on the first partition (hence the hda1). For the speedtouch I would recommend the speedtouchconf tarball http://speedtouchconf.sourceforge.net/
it's also possible to use the speedbundle http://www.linux-usb.org/SpeedTouch/index.html
but I find it more annoying.
To add users the command is useradd Dinerty or whatever user name you want. Every user should be part of a group so it might be best to create the group users first.
Then you can add the user and define their group at the same time.
useradd Dinerty -g user
Then you'll need to set a password so you can log in. If you don't want a password just press enter and it may complain but it should work