My experience with the Danes (Expert Level) was that they were one of the easiest to win with, quickest to win with, and probably the most boring.

You can bribe Sweeden almost immediately. Sweeden is both a gold mine for Florins and a producer (eventually) of Gold/Gold troops. Shortly thereafter you can add Norway. You don't need to go after any other countries for another two hundred years.

As pointed out, you don't need to build horses for a long time as the aristocracy seems very busy in the bedroom.

You only need enough troops to keep the privinces happy and to keep Germany from attacking Denmark which they never seem to do. Actually, nobody ever seems to attack which means that you can pump out Longboats from your three Provinces and set up a worldwide trade route very quickly.

So, until the Mongels show up (AD 1230) all you need to do is upgrade buildings, build ships, and collect money. No battles necessary. The years go by very quickly. Norway is good for the Special buildings (e.g. Military Academy), Sweeden is good for upgraded troops, and Denmark is good for whatever else you want early like cannons and Gold Armor Pikemen. Norway can produce the first gunpowder ships but no enemy has yet to confront me with the same kind of ship. Plus, I have had a 1/0/4 enemy ship take out my best gunpowder ship (3/3/6) so I am not sure how valuable they are. As long as my Ship Stack is bigger then whatever is being attacked, I seem to win regardless of the ship types.

1230 AD you can take over Livonia, Finland, Norvgood, and start on the British Isles. With all your ships, wiping out the English fleet (or French if they have done a number on the British) only takes a couple of years or so. Because you will have somewhere around a million Florins you can bribe your way into most of those countries without fighting and gain enough units to keep the locals happy and discourage enemy attacks. Also, since you have upgraded buildings so fast, your troops will have better Metalsmith/Armor upgrades then anybody you choos to take on. It is really no contest.

With the British Isles and NE part of the map under control you can go back into sleep mode until about AD 1300. In AD 1270 you get the trading upgrade which gives you even more money.

By AD 1300 you should have so much money and such powerful troops that total conquest is fairly easy. For me, leaving Central Europe to last worked best. Some of those countries can be attacked from so many directions that they can be difficult to hold. Going from the West side of the map to the East worked but there are likely many strategies that will work. Bribing everything in sight both gains you territory and weakens opponents. From about three million Florins I was down to less then five hundred thousand before total victory was achieved. Also, since you are putting the hurt on so many places at once (i.e. cutting income) revolts will start to happen all over the place (to your enemies). Keep your taxes low (you don't need the money) and your troop count high (you get all you need with bribes) and the same won't happen in your provinces.

Anyway, this is just one person's experience and in no way implies that it is better then any other persons choice of strategies. Also, since you spend so many years without a battle it can get tiresome. I don't recommend it. The game is really fun when you have to fight your way to victory. The Special Achievements method of victory gives a little more variety, but if you just focus on total conquest you will win anyway. I lost to the Turks even though I had achieved all the goals and they hadn't. They owned most of the world which earned them lots of points even though conquest was never a stated goal, just a point add-on option.

It is a great game and it is a little scary to think of what it will be like when the AI's get smarter.