1)
What is "Tzeischa u'Vo'echa"?
1.
Radak: You will leave Galus b'Shalom, and come to Eretz Yisrael b'Shalom.
2.
Malbim (7): He will guard you in all places.
2)
Why does it say "me'Atah v'Ad Olam"?
1.
Malbim (7): He will guard you at all times.