What are my chances of becoming a cop?

I live in new jersey. I want to become a state trooper. I am going to finish college with degree in criminal justice( but i can still double major if someother major would help also). I have clear record, but i did get some dteentions in high school and i did smoke pot a few times but a long time ago. what are my chances of becoming a state trooper? Are there any tips you can give me for the process of becoming one? Thank you :)