Skilling is simple use very fast low damagaing skills on a mob or dummy which has very high def but low attack (less pot useage then aswell). Our fav is burning hands and freeze. Both level(Cabal gold) 9 and use auto attack. Since the 2 skills are the fastest ones in the game. That can be used for skilling.
You should use them but you do gain more skill exp from lances or cannons in Cabal. Thou they take abit longer to cast/cool down and deal more damage and skilling over level 90. It is a pain anyway but since dummies are now free for you to use (If you have done the level 90 battle style rank up we would say use them instead of dancing afk or even.
If you leave computer on and your character on them, you can gain around 8 magic skill ups (Rank dependent) and a fair amount of sword skill ups again. Rank dependent and thats is going on leaving your character afk on dummies for around 5-7 hours.
You have a couple of choices here, you can go tierra gloriosa and exchange your Wexp reward for skill exp, do eod b1f runs, and get 5000 skill exp reward when dungeon is finished, or you can do the normal boring skilling, using your adept set. The eod b1f we would prefer in your case, as you can level(Cabal powerleveling) up also. Go skill on Lihorn zombies in UG at the place where the bloody lihorn zombie (iirc) spawns. Use burnning hands , freeze and random arrown while wearing 42-45 skill exp gear.