It's been awhile since I used Mandrake
If you look in the drakeconf
You should see something for setting up your internect connection...
You are going to be doing a PPP connection..
You should be able to do it out of the box..
just enter your username and password. where it shows and Mandrake should do the rest for you..
try typing in konsole:
and enter your username
eth0 (hopefully, cuz usb defeats the purpose of highspeed)
no (you're paying big $$ so why not have it always on)