Self-defense, how to proceed legally, what to do and what not to do.

Hello sir/madam! Today i had a verbal quarrel with a guy at a job who is physically quite stronger than me. I am a normal thin guy. He is not muscled, but is fat. He is a aggressive, vulgar and dictating kinda guy. I am a rebel type. I don't budge to his orders. This infuriated him. I am new to the job. I can't even possibly stop him, he can easily overpower me and my hands can't really do much. He could easily pummel me to fainting. But i really need this job, i can't quit this and neither can i bear this unjust authoritarianism by a co-worker. I am sure that if i don't dance for his tune, he's going to beat the damn out of me. I don't even know self-defense art. After some thought, i decided to carry with me a 20-25cm, 1-3 inch thick metal rod in my pocket, to be used in self-defense if he physically attacks me. And i am also very much thinking about immideatly legally proceeding on him, to file a police case on him for attacking me. Please help me out. What should i do and not do?