Adding Tracks
Each new project starts with 8 blank tracks.  You can add tracks by clicking the +Track button above the tracks to the left of the time line.  You can also click Add Track followed by selecting the type of track from the Tracks menu to append a track.

Inserting A Track
If you would like to add a track at a specific location, select the track before the insertion location and then click Insert Track, followed by selecting the type of track from the Track menu.

If the track isn't where you wanted it, you can always move the track.