Who came to Abraham?

Genesis 15:1-4 NWT

After this the word of Jehovah came to Aʹbram in a vision, saying: “Do not fear, Aʹbram. I am a shield for you. Your reward will be very great.” Aʹbram replied: “Sovereign Lord Jehovah, what will you give me, seeing that I continue childless and the one who will inherit my house is a man of Damascus, E·li·eʹzer?” Aʹbram added: “You have given me no offspring, and a member of my household is succeeding me as heir.” But look! Jehovah’s word in reply to him was, “This man will not succeed you as heir, but your own son will succeed you as heir.”

Who came to A'bram?
* the word of Jehovah
What did A'bram call him?
* Sovereign Lord Jehovah
Genesis 15:5-7 NWT

He now brought him outside and said: “Look up, please, to the heavens and count the stars, if you are able to do so.” Then he said to him: “So your offspring will become.” And he put faith in Jehovah, and He counted it to him as righteousness. Then he added: “I am Jehovah, who brought you out of Ur of the Chal·deʹans to give you this land as your possession.”

Who brought A'bram outside?
How could A'bram be lead outside unless Jehovah appeared visibly?
Who did A'bram put his faith in?
Who did "the word of Jehovah" say he was?
John 1:18 NWT

No man has seen God at any time; the only-begotten god who is at the Father’s side is the one who has explained Him.

If no man has seen God at any time and yet the "only-begotten god" is the one who makes him known... 
Who is the "god" that A'bram saw?
John 8:39-40 NWT

In answer they said to him: “Our father is Abraham.” Jesus said to them: “If you were Abraham’s children, you would be doing the works of Abraham. But now you are seeking to kill me, a man who has told you the truth that I heard from God. Abraham did not do this.

John 8:56-58 NWT

Abraham your father rejoiced greatly at the prospect of seeing my day, and he saw it and rejoiced.” Then the Jews said to him: “You are not yet 50 years old, and still you have seen Abraham?” Jesus said to them: “Most truly I say to you, before Abraham came into existence, I have been.

Jesus says that "Abraham your father rejoiced greatly at the prospect of seeing my day, and he saw it and rejoiced"... 
When did Abraham see Jesus? 
John 1:1 NWT

In the beginning was the Word, and the Word was with God, and the Word was a god.

John 1:14 NWT

So the Word became flesh and resided among us, and we had a view of his glory, a glory such as belongs to an only-begotten son from a father; and he was full of divine favor and truth.

Who is "the Word"?
Genesis 15:4-7 NWT

But look! Jehovah’s word in reply to him was, “This man will not succeed you as heir, but your own son will succeed you as heir.” He now brought him outside and said: “Look up, please, to the heavens and count the stars, if you are able to do so.” Then he said to him: “So your offspring will become.” And he put faith in Jehovah, and He counted it to him as righteousness. Then he added: “I am Jehovah, who brought you out of Ur of the Chal·deʹans to give you this land as your possession.”

Who did Jehovah's word say he was?