This will get you in the ball park. For 6011 or 6010 set the machine 15 amps for every 1/32" of welding rod. 3/32" 6011 45 amps, that gives you a starting point, thicker metal, higher amps. For 7018 you can double that, 3/32" 7018, 85 amps. 1/8" 7018, 120 amps. This is what I ran with DC electrode positive, an AC machine might be different. Haven't ran one of those in years, can't remember back that far.
Those numbers are just a starting point.