You might want to keep your scales until you come across a Xunlai agent for storage. They become tedious to farm later, when you might need them.
Check your quest log. It usually directs you to the next trainer for your primary. If there's not, you've either not gotten the quest or you have all the skills for your primary. If it's the latter case, it's time to work on your secondary. I recommend trying all the secondaries and all their skills before finally choosing one. There should be 2 trainers for each secondary profession.