Just writing this cos i never actually written one before. This is based on what I've talked to other FBs about no more no less.
Stats - Fbs have to have level stats (up to lvl 100 their pretty much equal). after talking with both FBs - str and dex i think dex ones are better (more rounded att/def). to be able to wear +7 armour and weapons then - try this
Str - 227
Int - 227
Dex - the rest (at lvl 123 i have 575 dex)
Skills - generally use magic cannons til you hit sword in master +. best ones are stone, aqua wind and lightening to use in Force Enchanter (give the strongest one) so all those at level 20. all buffs and debuffs also best at level 20 (four buffs i use are wind movement, earth guard, lightening blade and aqua vitality. these give around +620 hit rate, +320 defense rate, +29 defense, +49 attack, +100 hp and mp (with +6 regen every 2 secs).
For combos I use 4 skills in pve;
infernal impact (lvl 9)
dance of ruin (lvl 20)
infernal stigma (lvl 18)
force impact (lvl 15)
these give me a perfect combo. all else i stuck at lvl 20 cos meh what the hell

. i use force impact, infernal stigma and force impact as well as abyssal crystal in pvp - 3 strongest attacks plus at these lvls will fit in a combo)
You can
buy Alz if your funds aren't sufficient for this.
Don't bee too proud to consider
buying Cabal Online Alz .