You have to learn what all the knobs and sliders do on your amp, right along with your guitar. Pick a real easy song, it can even be a warmup exercise. Use some of the settings posted here as a base. Play some... tweak some settings. Repeat. Don't be afraid of going back if you need to. Write your settings down when you find stuff that sounds good! You might find that a very slight adjustment here and there is all you need.
[FONT=Comic Sans MS]Still learning. One riff at a time. [/FONT]