Only spend the points you have to spend before the player is created, don't spend the initial 15 SP after he is "born". Other than that, pick either speed, agility, vision, or strength or tackling and take it to 25, and then pick something you can train with it (ie agility for speed, tackling for strength) and put the rest of the points into that.
Also I recommend you wait until day 40 or 41 to create.