Patricia,
The WT says there are two hopes but the Bible says there is only one. (Eph. 1:18; 4:4)
The 144,000 and the great crowd are one and the same.
Revelation 7:9 says the great crowd are "out of all nations and tribes and peoples and tongues." Revelation 5:9, 10 says regarding those who will reign with Christ that they are "out of every tribe and tongue and people and nation, and you [God] made them to be a kingdom and priests to our God, and they are to rule as kings over the earth."
Revelation 7:9 also says the great crowd were "before the throne and before the Lamb." Revelation 4:10 and 5:8 say the 24 elders were "before the the One seated upon the throne" and "before the Lamb." The WT interprets the 24 elders as the 144,000.
There are others similarities.
Will the 144,000 alias the great crowd be in heaven or on earth?. At Revelation 5:10, other translations say they will rule "on" the earth.
Since Revelation 21:1 promises a new heaven and earth after the present heaven and earth have passed away, I think our main concern should be to gain salvation. Wherever it will be, the living will be with God and Christ and will see them face to face. There are all kinds of speculations floating around about the hereafter, but I tend to feel we won't know anything much for sure about it until we get there, if indeed we do.
Herk