Brand new user, 56k modem doesn't work, Help !!!

I am a student at ITT-Tech and my instructor handed me a cd for ubuntu and said install this. I installed it but I don't know how to get internet working. Can somebody please help me???? I have a motorola 56k modem with the driver disk and when I insert the disk linux says "cant mount the drive" or "insert disk and try again" do I need to do something special or what?

I looked and it does not say anything about landlines, the icon is there but when I click it all that shows up is Enable Network, Connection information (grayed out), Edit Wireless Network, and About. The modem acts like it does with xp when I dont load the driver. I need the internet because I have to do projects online for school, this is my first year in Computer Engineering and Electronics Technology, if I cant get this going then I am going to be missing a bunch of assignments. So any help at all would be greatly appreciated. Thanks Rick

ok,will go try it and let you know what happens