I would advise waiting until you have played for a significant number of played hours (read as: days - not necessarily all on the same PC) before requesting a karma review. A lot of players die quickly on the first several characters. If you request a karma review after your first character, a 10-hour ranger, died, I can guarantee you that no karma would be granted.
As a point of reference, the first karma point given is almost always for "longevity" which (in a very simplified nutshell) is for having stuck around the game long enough to know basic societal norms and that sort of thing. It means that you know that elves aren't Legolas, that magick is not Harry Potter, that templars are scary dudes and dudettes, and so on down the checklist.
It takes time. This is almost never given before six months real time since account inception.
Other good habits to get into are sending in a character report once a month so we know what your PC's up to, or ad-hoc if your character is involved in something that you think we ought to know about. This increases our visibility into your PC, which is a good thing. No one ever got karma for flying under the radar.
As has been previously noted by players, there is a formalized system in place now, for how karma can be granted. You can see that in the links LauraMars posted or checking out "help karma" in game.