From the sound of your question you are not a jw or exjw?
Gopher is right- they interpret Rev 7&14 to mean that 144,000 of their extremly faithful will go to heaven and 'a great multitude' will go to a paradise earth. Both these groups to them are Jehovah's Witness only. They do not believe in an immediate heaven or hell after death but that people go into nonexistance until God remakes you from his memory after armageddon and judge you from there- The good to either earth or heaven and the bad get annihilated into nonexistence again.
The "multitude" is the average JW and is subject to the rule of the 144,000 sprecial JWs even on earth- they have to go through the 144,000 as their mediator to God instead of Christ.
Never mind that the 144000 are said to be jewish not JW and that Rev.7:9 says that the great multitude is before God's throne too, not on earth. Just another inconsistency though, I guess.