Crusader Kings 2, like every other Paradox grand strategy, features an adjustable speed setting, even a pause button. It is a lot like a TBS in terms of flow. The troop management is honestly very simple, since you don't really do much with the armies, except making a formation, pointing them in the right direction and then being amazed at how they are slaughtered by the enemy. The AI is quite capable of handling itself and using everything at it's disposal, in combat and outside of it.
As for support, Paradox has a very good track record regarding that, especially for games they directly produced. CK2 just recieved another patch recently if I'm not mistaken, and it'll get an editor soon that will allow you to create your own leader, which you can then stick inside the game.
CK2 seems very complex on the surface, and it is, but playing it is more akin to The Sims (if that one actually had gameplay and it was good) than most other grand strategies they've made in the past.
As for a goal, world domination would be one. Failing that, expand your dinasty for as long as possible and have fun along the way. It's a sandbox game.