1)
Did this occur right after they made David king?
1.
Malbim: No. We see below (verse 13) that this was after he had conquered Yerushalayim, and Tziyon was Ir David.
2)
What counsel did he take with them?
1.
'Rashi': He said, you engaged in fixing yourselves, so you will have a king to save you ? now engage in Hashem's honor!
3)
Why does it say "l'Chol Nagid"?
1.
'Rashi': He called to each leader to take counsel.
