juz get ice to 20 for its lvl 1 snow shield 1st...u can level ice up later and the phy def buff in ice is insignificant until lvl 60 (42 increase)
and juz keep ur bich 2-3 lvl behind and ur fire 5-6 lvl behind and light ard 8-10 lvl behind
ultimately, bich 80 fire 80 light 80 ice 60 (personally i tk ice 40 cuz 30% snow shield is max a pure str can use and 30 more phy def isnt worth the sp for it and u gotta delvl it anyway when 90 comes)
as for the specific skills, look at manowar's guide

its detailed enough