Follow the video step by step to get a basic beat and bassline down.
OTHER THINGS TO CHANGE:
~The tempo of the song (click where you see 120 at the bottom of the screen. Try higher and lower numbers)
~The sound of the drums (click where it says "Machine" in Patterns Beat Maker,)
~Adding effects to your tracks (click the "Effects" button when each track is open -- I think overdrive sounds nice on the kick and bass, reverb and delay are popular on snares and other things).