in skills the normal stats are all showen, str, int ,dex , agi well int is showen as "magic" but .. same thing
setting them on 100% for example means you use the entire power that comes from those stats (meaning the skills are judged by those certain stats)
attack power is what you get from the weapon, the higher you put it the more power your total attack power will add to the skill
and lastly effect rating, that's the actual power of the skills, judging by all the stats and weapon power in the way you defined it this will choose the amount of damage dealt by the skill, setting it to any number between -9999 to 9999
you might have noticed, the rest of the stuff can't go under 0, this is cause effect rating when set to under 0 will cause a healing effect.