You should say:

when you heard about the news

what this news was about

how you got this news

and explain why you think it was a good news

参考范文：

After I finished my graduation, I applied for 2-3 jobs and faced the interviews in these companies. One day I got a phone call from one of the companies from the HR department and the caller confirmed that I was hired for the job I applied for. This was a very exciting and good news for me as I was expecting to start a job so eagerly.

I did not know the person who called me at that time but later I found that he was the head of the human resources department of the company and his name was Kane. I heard it in (…say a year i.g. 2017b…) and it was probably June.

My parents and relatives wanted me to get involved in a job right after my graduation and I felt the same. Some of my classmates were already doing jobs and I thought I should start a job as well. After I got the job confirmation call, I was very excited and happy. The first job confirmation, in my opinion, is very significant and exhilarating and I felt no less. I was so happy that I instantly confirmed that I’d be joining the job from the next week. Then I shared the news with my parents and sisters and they were very happy as well.

　　Part3相关问题：

• What are the different of communicating online and face-to-face communication?

• By what means do people receive news from social media?

• How do people share good news?

• Why people do not share good news of their own?

• How do people share good news with their neighbours?