Download and install Audacity on your computer.
Open Audacity, click on the "File" menu, "Open," and then open the audio file that you want to put track marks into.
Play the file or scroll to the second song in the audio file where you want a new track mark for the CD.
Click "Project," then "Add Label at Selection." Once you've created a new label, you can type in the name of the song you want to export to a CD.
Repeat the process for the rest of the audio file, breaking it into as many tracks as you want.
Click "Save as" and save the file as a new music file. Your original file is preserved.
To burn the tracks onto a CD, click "File" and then "Export Multiple" to export the tracks as separate files to burn to your CD.