I would say first light then cold Lighning more damage and more/better buffs then ice. since u are s/s u don't ice in early lvls (later mobs will hit harder so...)
Unless you plan on farming on ongs at an early level, keep Light 3 levels below your char level and level to about 40, keeping bicheon and ice close behind, maybe around 30 or so. Then build a nice 5-7 gap before hitting level 50 and start farming, i think penons are nice to farm on at this level. I certainly get good sp this way, of course if you wanan farm ongs at level 25-26 range is the best and easiest option.
Server: Sparta - Inactive IGN: Hideoki Level: 9x Build 120% Pure Int S/S + Pure Force and 100% sun whore lol
PServer: Salvation - Active IGN: Hideoki / SuddenDeath - BigInJapan Build: Full Int Light/Cold/Bich level 70