1)
Why did Hashem need to say that He made the land, people and animals?
1.
Malbim: I own all of them, and I constantly sustain the creation with My strength, so I may appoint kings as I desire.
2)
What is the grammatical form of "Yashar"?
1.
Radak: It is a verb in past tense. There is a Kamatz under the Yud and a Patach under the Shin.