I just passed my test and I want to know what is next.
You will receive an interim license that will allow you to drive and that you must to keep it with your photo learner permit. You will receive your photo driver license in the mail  in about 2 weeks.
What should I do after passing my road test if I am 16 years old and I have a Class DJ driver license?
You must obey the restrictions for junior drivers. For more information, I invite you to see the Graduated Driver License GDL Law and restrictions on drivers under age 18.