Why does it say "v'Salu Alav"?
Radak: We hang on a peg (verse 23 compared him to a peg). Malbim - hanging the Kelim on him is a metaphor for getting their needs via him.
What are "ha'Tze'etza'im veha'Tzefi'os"?
Rashi citing Targum Yonasan: The children and grandchildren.
Rashi citing Menachem: This is like "Tzefi'ei Bakar" (Yechezkel 4:15, i.e. dung). I.e. they are infants that come out of their mother's womb. Tzefi'ei refers to something that leaves.
Radak: They are sons and daughters.
What is "Kol Klei ha'Katan"?
Rashi: The small ones in his family will glorify themselves in him and rely on him.
Radak: Even the small ones will glorify themselves in him, for his grandeur will be so famous. Kli Katan is a Kli that a Katan uses.
Radak citing Targum Yonasan: From the great to the small.
What is the meaning of "mi'Klei ha'Aganos v'Ad Kol Klei ha'Nevalim"?
Rashi citing Targum Yonasan: From Kohanim [Gedolim] who wear an Efod, to Leviyim holding lyres. Aganos refers to Klei Shares with which Kohanim serve in the Beis ha'Mikdash; Leviyim sing with lyres.