Ratings

H	Stands for handedness, lefty or righty
Ps	Postion, Center, Left Wing, Right Wing, Defense, Goalie
Ag	Aggression, how hard a player forechecks, how much he hits, how much he fights and goes into traffic.
Qk	Quickness, basically how fast he is on skates in a straight line
Pw	Power, how big a player is, but how big he plays should be considered
Fa	Fatigue, how quickly he tires.
In	Injury, how resistant a player is to injuries
Pn	Penalty, how many penalties a player tends to take ( the higher it is, the fewer penalties he takes)
Sk	Skating, basically a player's skill on skates, how well he turns, how quick he accelates, how tight he turns, how fast he stops, how agile he is.
Pa	Passing, how well a player passes and makes plays. Gretzky is a good example of a 9 here. Also think about how likely he is to pass as opposed to shoot.
PC	Puck Control, how good a guy is at stick handling. A 9 here would be Jaromir Jagr.
Ck	Checking, basically how well and how willing a player is to back-check (i.e. how good he his defensive-zone coverage is, how good he is at blocking shots, does he give the puck away, etc.)
Sh	Shooting, how hard, accurate, and quick(release) a guy's shot is. Also give consideration to goal scoring ability.

Also, the ratings are slightly different for goalies:

Ag	Aggression, how likely the goalie is to come out of the crease, to take away angles, or to play the puck.
Qk	Here it is more like how quickly the goalie moves around in his net.
Pw	pretty much the same as forwards, but maybe a higher power goalie is bigger (and therefore covers more net standing)
Fa	same as above
In	same as above
Pn	same as above
Sk	how good a goalie is at moving around in his net.
Pa	passing, how good a goalie is at passing. a 9 would be Barrasso or Hextall
PC	Puck control how well the goalie controls rebounds, etc.