Revelation: Seven Messengers with Plagues

How did John know what the seven messengers were holding?

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Revelation 15:1 Another breathtaking sign appeared above. Seven messengers held the seven last plagues, which completed the expression of God’s anger.
King James
Revelation 15:1 And I saw another sign in heaven, great and marvellous, seven angels having the seven last plagues; for in them is filled up the wrath of God.

Where did the victorious get their song and the ability to play harp?

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Revelation 15:2–4 The victorious over the beast and his image, who did not have the beast’s mark or his identifying number, held God’s harps as they stood upon a glassy sea of fire.  They sang the song of God’s servant Moses and the song of the Lamb. “All you have done has been mighty and marvelous, Lord God Almighty. Your ways are righteous and true, O King of God’s people. Who cannot reverence you, Lord, and give you praise for who you are? All nations will worship you, for you alone are holy, and your righteous deeds have been revealed.”
King James
Revelation 15:2–4 And I saw as it were a sea of glass mingled with fire: and them that had gotten the victory over the beast, and over his image, and over his mark, and over the number of his name, stand on the sea of glass, having the harps of God. And they sing the song of Moses the servant of God, and the song of the Lamb, saying, Great and marvellous are thy works, Lord God Almighty; just and true are thy ways, thou King of saints. Who shall not fear thee, O Lord, and glorify thy name? for thou only art holy: for all nations shall come and worship before thee; for thy judgments are made manifest.

How can gold vials be filled with God’s anger?

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Revelation 15:7 One of the four creatures gave the seven messengers seven gold vials filled with the anger of God, who lives forever.
King James
Revelation 15:7 And one of the four beasts gave unto the seven angels seven golden vials full of the wrath of God, who liveth for ever and ever.

Why was the sanctuary filled with the smoke of God’s power and glory?

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Revelation 15:8 The sanctuary was filled with the smoke of God’s power and glory, so no one could enter until after the seven messenger’s plagues had been fulfilled.
King James
Revelation 15:8 And the temple was filled with smoke from the glory of God, and from his power; and no man was able to enter into the temple, till the seven plagues of the seven angels were fulfilled.