What is the command "Emar Na"?
Radak: Tell [Beis Meri 1 ] that you will explain the Mashal.
Surely Yechezkel will explain it! Perhaps the text on Radak should say 'Emor Lahem.' (PF)
What is the question "Mah Eleh"?
Rashi: What is this riddle? He explained it to them.
Which king and his officers were taken?
Rashi: "Tzimras ha'Erez" (3) refers to Yehoyakim 1 and his officers. Malbim - Tzimras ha'Erez is the king; "Rosh Yenikosav Kataf" (4) are the officers.
Radak: This refers to Yehoyachin.
Rashi (Divrei ha'Yamim II, 36:13) says Yehoyachin and his entourage.
What hinted to going to Bavel?
Rashi: This is "Ir Rochelim" (4).