When creating a character, you will probably want to balance STR, DEX and INT evenly. Since you will be wearing primarily leather armor and using a dagger, your starting STR won't need to be too high to equip this gear. Be sure to have INT high enough so your starting mana will allow for a few spells, Mark, Recall, Heal etc.
Stats will raise very quickly if you see-saw the skills Focus and Meditation. One up while the other down.
Ending Stats, I agree with DJAd. 100 STR - 80 DEX - rest in INT.
Imbue some Mana and Stamina increase on your gear.
If you're going to make this char more of an offensive mage, then I would say take INT to 125 and put rest in STR-DEX at about a 70/30% split; more in STR.