Battles Medium, else the balance is gone with the insane boni the AI gets on H or VH.

Of course, when you play with elite fullstacks things get too easy, so play with a realistic army.


Campaign depends. VH and AI will try to murder you. H and it'll be aggresive. M and you can enjoy a slow role playing campaign.
I like role playing EB more than blitzing my way through it on VH, but that's just a personal choice.

Don't forget to read the FAQ and the other important stickies!
That's the most important advice for now.