How would they see the Kavod of Hashem in the morning?
Rashi and Rashbam: It means that Hashem would provide them with bread in the morning, with a shining countenance. 1
Ramban (citing also Targum Onkelos): Refer to 16:6:1:2.
What did Moshe mean when he said (About himself and Aharon) "ve'Nachnu Mah"?
Rashi, Ramban and Targum Yonasan: He meant "Of what significance are we". 1
Rashi (in Va'eschanan, 7:7): This typifies Yisrael, who always belittle themselves. 2
Chulin, 89a #1: 'I have a strong desire for you', says Hashem, 'because even when I shower you with greatness, you make yourselves small. I bestowed greatness upon Moshe and Aharon ... '. 3
Chulin, 89a #2 Based on a Gezeirah Shavah "Nachnu Mah" "Toleh Eretz al B'li-Mah in Iyov, 26:7, the entire world exists only because of Moshe and Aharon. 4
Chulin, 89a #3: What the Torah says about Moshe and Aharon "ve'Nachnu Mah" is greater than what it says about Avraham "ve'Anochi Afar va'Eifer". 5
Ramban: So how could Yisrael complain about them when everything that happens is orchestrated by Hashem, and they were totally incapable. This is the meaning of the word "Mah" - as in Tehilim, 8:5 and in Yeshayah, 2:22. Rashi, commenting on the Pasuk in Devarim, 7:7 "for you are the smallest of all the nations": This is the mark of Tzadikim, who negate themselves before Hashem, like Avraham, who declared "I am dust and ashes" - Bereishis 18:27, and Moshe and Aharon, who declared "and what are we!"
See note in answer #1. See also Torah Temimah, note 11.
See note in answer #1.
See Torah Temimah, note 12.
See Torah Temimah, note 13.