Goalkeepers
Usually I put most focus points on defence, speed and power, I save the rest and focus them on a player card such as 1 on 1 keeper or penalty saver.
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Defence
Look at your players weaknesses, I assign most focus points to defence, speed and power as well as a few points on dribbling so agility stays at a good level. Power and speed is important here and obviously the defence stat should be your main focus.
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Midfield
depending on your player try to balance it out a bit, I like versatile midfielders who are capable in defence and attack so I share out the points fairly evenly. Passing is of course important, if you assign points to power body balance will rise.
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Strikers
I assign 1 point to defence(if you have a CF with the chasing back card) and the rest on shoot, power, 2 points towards pass and the rest evenly spread.