SK needed everywhere on farm - any instances zone, labs, SOA, in pvp he needed only for TOSh in archer partys. Solo pvp too hard for him in low boost. Until you up lvl to 83 you will be unnecessary in any party. Try after 80 create archer party for exping into the MOS, upper levels. There will be good exping for you and you can use Banish Seraph and kill angels almost with one shot
For "tank" build - +4 wit -4 int +5 con -5 str and vorpal heavy set, blunt SA HP, sword SA Focus, wolf or Divine beast from Divine summoner transform
For "DD" build - +4 wit -4 int +5 str -5 con, elegia heavy set, blunt SA HP, sword SA Focus, wolf or Divine beast from Divine summoner transform