Join a strong guild
There are many kinds of crafting skills in Mortal online, but personally I think material gathering is the best choice for normal players. The others are all useful ones, but you need to invest large amount of materials and scrolls, which takes Mortal online gold and energy. The gathering skills can upgrade when you are gathering. You can store these materials and trade with others.
Some special kinds of mana stones are popular and hard to get. In my server, there are too many DPS classes such Assassin and Sorcerer, so their equipments are really expansive. For the same set, Dagger often sells much well than other weapons.
If you have regular team or you join a strong guild, you and your friends can group to farm the same boss for several times. The drops are always awesome.