I've always said the Danes were the easier faction - and above tactics explain why. You just have not to forget to put several ships in zones where others have fleets - so that noone dares to challenge your sea supremacy. And you roll over anyone opposed to you

That being said, you're short on money with the Danes in the beginning, and the upkeep cost of the peasant is a no-go for me. They might cost nothing to build up, but damn, they're expensive to maintain. That's the reason why I always go for quality in my armies - even for garrisons.