Hi D F..
Once you have loaded all your tracks that you want, they should appear on the untitled channel (track channel), as single individual tracks, numbering t1 - t12/13/14, down the left hand side or as a continuous single wave patten as t1 at the top of your screen.
To get this audio out as a mp3 (ipod or a portable device) or a audio wave file, you simply click on - file, export as audio, choose your save location, select mp3 or wave, then name the file and hit save...
Job done.
Hope this helps.!!!
Good Luck.