Just a thought on the Good news. The Apostle Paul said this.
The Resurrection of Christ
1 Now, brothers, I want to remind you of the gospel I preached to you, which you received and on which you have taken your stand.
2 By this gospel you are saved, if you hold firmly to the word I preached to you. Otherwise, you have believed in vain.
3 For what I received I passed on to you as of first importance: that Christ died for our sins according to the Scriptures,
4 that he was buried, that he was raised on the third day according to the Scriptures,
5 and that he appeared to Peter, and then to the Twelve.
6 After that, he appeared to more than five hundred of the brothers at the same time, most of whom are still living, though some have fallen asleep.
7 Then he appeared to James, then to all the apostles,
8 and last of all he appeared to me also, as to one abnormally born. (1 Cor. 15:1-8 NIV)
He also said this.
No Other Gospel
6 I am astonished that you are so quickly deserting the one who called you to live in the grace of Christ and are turning to a different gospel— 7 which is really no gospel at all. Evidently some people are throwing you into confusion and are trying to pervert the gospel of Christ. 8 But even if we or an angel from heaven should preach a gospel other than the one we preached to you, let them be under God’s curse! 9 As we have already said, so now I say again: If anybody is preaching to you a gospel other than what you accepted, let them be under God’s curse!
(Gal 1:8)
In the book Jehovah's Witnesses Proclaimers of God's Kingdom on page 119 "A real milestone was reached, therefore, in 1925 when The Watchtower of March 1 featured the article "Birth of the Nation." It presented an eye-opening study of Revelation chapter 12. The article set forth evidence that the Messianic Kingdom had been born-established -in 1914, that Christ had then begun ro rule on his heavenly throne, and that thereafter Satan had been hurled from heaven down to the vicinity of the earth. This was the good news that was to be proclaimed." This established kingdom also includes the beginning of the resurrection to heaven shortly after 1914 as the144,000 make up the kingdom. Further down on the same page "The good news of God's Kingdom continues to be central to the beliefs of Jehovah's Witnesses. Since the issue of March 1, 1939 their principal magazine, now published in over 110 languages, has been borne the title The Watchtower Announcing Jehovah's Kingdom." I think that this is different to the Good News that the apostle was preaching but maybe I'm wrong.