I just finished the tutorial (after realizing the key was to upgrade the training center to produce Praetorians on turn 1...not obvious considering it was a tutorial!). Now, I am wondering which campaign to tackle? (Or are they all roughly equal difficulty?) I have almost no HoMM experience, other than a brief (incomplete) play of one scenario of HoMM3 at a friend's house awhile back.
With that said, are any of the main scenarios more newbie-friendly in your opinion?