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There's a great selection of heroes! But I especially like Mephala, Kirre, and Yenova.
I don't really like Ivor because he's a specialist in elves, but they give him offense.
At the beginning, I run around with centaurs and elves.
I develop the Castle for income, and I always include elves.
I never take dendroids or lumberjacks into my army.
And if I have very little money, I prefer to recruit a bunch of upgraded centaurs rather than upgrading pegasi and unicorns.
I prefer these skills:
Offense
Armor
Logistics
Earth Magic
Water Magic
Wisdom
Leadership or Resistance (depending on the situation)