Bible resources related to "What happens after I die?"

When someone has been clinically dead and is brought back, can they tell us about the afterlife?

Did Jesus promise that the thief who was crucified with Him would go to "Paradise" that same day?

What does Revelation 6:9-11 [9] And when he had opened the fifth seal, I saw under the altar the souls of them that were slain for the word of God, and for the testimony which they held:
[10] And they cried with a loud voice, saying, How long, O Lord, holy and true, dost thou not judge and avenge our blood on them that dwell on the earth?
[11] And white robes were given unto every one of them; and it was said unto them, that they should rest yet for a little season, until their fellowservants also and their brethren, that should be killed as they were, should be fulfilled.

See All... mean? How is this passage related to end-time events?

Is the soul talked about in the Bible an immortal part of human beings...or is it something else entirely?