just grab a microphone and download a program like cool edit pro it's easy to use and really effective i can't remmeber a website for it .. i'm sure someone else can help you there .
as for the solo , i wouldn't worry to much about getting it exact .. when playing
van halen i've found it's more about the feel of ed rather than the notes ... and your bound to be far more comfortable playing something sorta right than trying to sound exactly like ed (which no one can ever do.)