Rubyee,
To turn the music in to MP3 format, you will need a program that will "rip" the audio tracks off the cd in to the mp3 formate and seve them to your harddrive.If you have Easy Cd creator, there is a built in ripper program that will rip the cd tracks indigualy or in batches depending on what you tell it to do.
HERE is the download.com list of rippers if you don't have one already in your chosen cd burning program. Create a directory for the music MP3's to be saved in, and follow the programs directions.
The annoying part will be sitting there with the program naming each track as the computer makes an mp3 copy of it.
As for your freind. MP3 is a universal iso format, so any computer, regardless of operating system, knows what to do with the music files you send. Obviously the cd's will be data cd's, and the mac should recognize the cd's contents when the cd is inserted. The user can double click on any track to listen to it or highlite and copy the tracks to their harddrive.
And yes this is the right forum to ask such a question in