People will not be saved in the 1000 year reign as they are in the Church age. Here is how I see it.
9: I beheld till the thrones were cast down, and the Ancient of days did sit, whose garment was white as snow, and the hair of his head like the pure wool: his throne was like the fiery flame, and his wheels as burning fire.
10: A fiery stream issued and came forth from before him: thousand thousands ministered unto him, and ten thousand times ten thousand stood before him: the judgment was set, and the books were opened.
11: I beheld then because of the voice of the great words which the horn spake: I beheld even till the beast was slain, and his body destroyed, and given to the burning flame.
12: As concerning the rest of the beasts, they had their dominion taken away: yet their lives were prolonged for a season and time.
Dan. 7:9-12
The dominion of the beasts (governments of Earth) will be taken away. They will be replaced by Saints who overcome. The LIVES of some of the people in the nations that are left are spared (verse12) so that Earth can be repopulated.
Like when Israel came out of Egypt. The whole generation was to waste away in the wilderness and die for their sins against YHWH. Yet he said their children which did not know good and evil THEY would inherit the land.
29: Your carcases shall fall in this wilderness; and all that were numbered of you, according to your whole number, from twenty years old and upward, which have murmured against me,
30: Doubtless ye shall not come into the land, concerning which I sware to make you dwell therein, save Caleb the son of Jephunneh, and Joshua the son of Nun.
31: But your little ones, which ye said should be a prey, them will I bring in, and they shall know the land which ye have despised.
32: But as for you, your carcases, they shall fall in this wilderness.
Numbers 14:29-3
This explains how there will be mortals living on Earth in those days.
16: And it shall come to pass, that
every one that is left of all the nations which came against Jerusalem shall even go up from year to year to worship the King, the LORD of hosts, and to keep the feast of tabernacles.
17: And it shall be, that whoso will not come up of all the families of the earth unto Jerusalem to worship the King, the LORD of hosts, even upon them shall be no rain.
18: And if the family of Egypt go not up, and come not, that have no rain; there shall be the plague, wherewith the LORD will smite the heathen that come not up to keep the feast of tabernacles.
Zech. 14:16-18
The Church will be resurrected into immortal Spirit bodies. Just as the Angels they can switch to what people call "glorified flesh bodies" to live in the Earthly realm as needed. We will go back and forth between Heaven and Earth under the will of the Lord.
YHWH/JESUS will establish laws for the people of Earth that will be enforced with a rod of iron.
26: And he that overcometh, and keepeth my works unto the end, to him will I give power over the nations:
27: And he shall rule them with a rod of iron; as the vessels of a potter shall they be broken to shivers: even as I received of my Father.
Rev. 2:26
There will be much teaching in those days.
2: And it shall come to pass in the last days, that the mountain of the LORD's house shall be established in the top of the mountains, and shall be exalted above the hills; and all nations shall flow unto it.
3: And many people shall go and say, Come ye, and let us go up to the mountain of the LORD, to the house of the God of Jacob; and he will teach us of his ways, and we will walk in his paths: for out of Zion shall go forth the law, and the word of the LORD from Jerusalem.
Isaiah 2:2-3
The remnant of Jews that live in this New Earth will be favored highly. Also if anyone would commit sin they will be put to death seemingly as a child though they are 100 years old. Longevity will be restored as before the flood.
17: For, behold, I create new heavens and a new earth: and the former shall not be remembered, nor come into mind.
18: But be ye glad and rejoice for ever in that which I create: for, behold, I create Jerusalem a rejoicing, and her people a joy.
19: And I will rejoice in Jerusalem, and joy in my people: and the voice of weeping shall be no more heard in her, nor the voice of crying.
20: There shall be no more thence an infant of days, nor an old man that hath not filled his days:
for the child shall die an hundred years old; but the sinner being an hundred years old shall be accursed.
21: And they shall build houses, and inhabit them; and they shall plant vineyards, and eat the fruit of them.
22: They shall not build, and another inhabit; they shall not plant, and another eat: for as the days of a tree are the days of my people, and mine elect shall long enjoy the work of their hands.
23: They shall not labour in vain, nor bring forth for trouble; for they are the seed of the blessed of the LORD, and their offspring with them.
24: And it shall come to pass, that before they call, I will answer; and while they are yet speaking, I will hear.
25: The wolf and the lamb shall feed together, and the lion shall eat straw like the bullock: and dust shall be the serpent's meat. They shall not hurt nor destroy in all my holy mountain, saith the LORD.
Isaiah 65:17-25
So mortals and immortals will be living on Earth. The Church was something special in the plan of YHWH. During those approximatley 2000 years of the Church age he called out a certain number of people that he would favor. He would train them to be caretakers of the Earth as Adam was to have been before he sinned.
Then he would start all over again to fulfill his originl plan....to have a Planet of people who will be for his glory. Getting to long. Part 1