What are the implications of the Pasuk?
Targum Yonasan: It implies that the Mitzvos listed until here are those that Hashem commanded Moshe and that nobody has the authority to add to them.
Why does it say that Hashem sent Moshe to Bnei Yisrael?
Da'as Zekenim, Hadar Zekenim: The Shali'ach is worthy to send him to Bnei Yisrael, and they are worthy; their merit caused him [to reach his awesome closeness to Hashem.- refer to Shemos 32:7:3:1 and the note there.].