1)
What do we learn from "Ki Lekach Tov Nasati Lachem"?
1.
Brachos 5a, 48b, Avodah Zarah 19b, Menachos 53b: Tov refers to Torah. Ta'anis 7a - Lekach refers to Torah.
2.
Malbim: This corresponds to what I took (received) from my father; it is good due to itself, and I handed it over to you.
2)
What is "Torasi"?
1.
Rashi: It is Hashem's Torah. The Navi speaks on behalf of Hashem.
2.
R. Yonah: The Musar that I arranged. It is proper for youths and Chachamim - "Lases li'Fsayim Armah; Yishma Chacham v'Yosif Lekach" (1:4-5).
3.
Malbim: This is what I contemplated with my Binah; it is attributed to me.