Jesus told Nicodemus, that "no man has ascended into heaven but he that descended from heaven, the Son of man."(John 3:13) In addition, the apostle Paul wrote: "Therefore, brothers, since we have boldness for the way of entry into the holy place by the blood of Jesus, which he inaugurated for us as a new and living way through the curtain, that is, his flesh."(Heb 10:19, 20) Hence, prior to Jesus presenting his precious blood to God, no one had ascended to heaven.
Of those who go to heaven, no one chooses themselves, but are selected by God to serve in an official capacity as "kings and priests".(Rev 1:6) The mother of James and John asked Jesus to "give the word that these my two sons may sit down, one at your right hand and one at your left, in your kingdom." However, Jesus told her sons, that "this sitting down at my right hand and my left is not mine to give, but it belongs to those for whom it has been prepared by my Father."(Matt 20:21, 23)
Jesus, in speaking to his disciples, told them that they were part of a "little flock" that was "approved (by his Father) of giving...the kingdom."(Luke 12:32) Revelation 7:4 and 14:1 gives the number "bought from the earth" out of "every tribe and tongue and people and nation" (Rev 5:9) as 144,000.
These 144,000, the apostle Peter says are "living stones (that) are being built up a spiritual house for the purpose of a holy priesthood."(1 Pet 2:5) He further said that these are "a chosen race, a royal priesthood, a holy nation" that has the express assignment of declaring "abroad the excellencies of the one that called you out of darkness into his wonderful light".(1 Pet 2:9)
These, as a group, are called "the Lamb's wife", his "bride"(Rev 21:9), as well as "the holy city New Jerusalem".(Rev 21:2) These are also called "holy ones of the Supreme One (that) will receive the kingdom."(Dan 7:18) Thus, these "holy ones" will rule in God's kingdom along with Jesus Christ, in which Daniel 7:13, 14 says that Jesus, as the "son of man", was "given rulership and dignity and kingdom, the national groups and languages should all serve even him."
These "holy ones" are spoken of as "chosen ones" by Jesus (Matt 24:21, 24,31), for these are the ones chosen by God to serve as "joint heirs" of the kingdom with Jesus Christ.(Rom 8:17) Jesus, in giving the illustration of the "marriage feast", said that "there are many invited, but few chosen."(Matt 22:14)