1)
Why does the Torah add the words "Yehoshua ben Nun ha'Omed Lefanecha hu Yavo Shamah"?
1.
Targum Yonasan: This is Yehoshua's reward for serving Moshe in his (Moshe's) Beis-ha'Midrash. 1
1
Refer also to Bamidbar 27:15:1:1**. Because serving a Talmid-Chacham is greater than learning from him (See Ba'al ha'Turim).
