It is best to train. After all, no matter how talented you are, you still need polishing. Your road will be easier after training! There is no need to find an agent first. You have to audition where you want to go. If the boss or supervisor agrees to use you, you can go to the meeting. Or find a special introducer, the agent you mentioned, to see if others are willing to take you, but unless you are really talented, the possibility is too small. It is suggested that the former should be considered first. If you are famous, someone will take the initiative to come to you!