Registering A Trailer in NY

So, not surprisingly our fine Empire State can be confusing in the red tape.
If I get a kit trailer from Northern or Harbor Freight:
-I should register it when the frame is complete, but not the teardrop (less headache, right)?
-What else will I need to do?
Your help is greatly appreciated..... this is all so new to me! I'm nervous!
If I get a kit trailer from Northern or Harbor Freight:
-I should register it when the frame is complete, but not the teardrop (less headache, right)?
-What else will I need to do?
Your help is greatly appreciated..... this is all so new to me! I'm nervous!