If your just exporting tracks for your own listening, you might want to add a Compressor or Limiter on the Main out, so you can push the volume up a bit (all radio and pop music is pretty heavily compressed which makes the song sound louder but at a loss of dynamics. I usually just add a limiter on the main for volume in the Song page for exporting and remove it when I bounce it for the Project Page.) But it's usually better to master a group of tracks into an album -- New Project, should help get you started with that.