I make a "test character" to get used to the new controls, the new game mechanics, the new stories and NPCs, the new game world. I'll spend up to 100 hours with this test character. I may wander around the world, doing no quests at all, or I may sample bits of quest lines.
Once I get the hang of a game, I make my first permanent character. This is the character I quest with seriously. I may go through most of the quests in a game with this second character. I can spend as much as 500 hours doing this.
After all this is over, I finally start my first roleplaying character. I have to know a game very well -inside and out - before I can roleplay.