Why does the Torah see fit to inform us that Avraham rose early?
Rashi: To teach us that Avraham was eager to perform the Mitzvah 1 (in spite of the personal self-sacrifice that it involved). In fact, "be'Boker" implies that he did even wait until Haneitz ha'Chamah (Rashi in Pesachim, 4a).
As Chazal have taught "Zerizin Makdimoin le'Mitzvos" - Those who are eager to perform Mitzvos, perform them as soon as possible (Pesachim, 4a).
Why does the Torah find it necessary to tell us that Avraham saddled his donkey?
Rashi: To teach us that, even though he had servants, due to his love of Hashem and His Mitzvos (which causes a person to act irrationally) he made a point of saddling his donkey himself. 1
What is the significance of the two servants that Avraham took with him?
This must be speaking with regard to the homeward journey, where Avraham expected to return without Yitzchak, since, on the way there, he had Yitzchak as company, and he would only have required one servant.
Bereishis Rabah 55 says that this is Derech Eretz. Chochmaht u'Musar (4 p.12) - we must obey intellect - nature, Derech Eretz - even without a command. It is our teacher and guide.
Rashi says that the two servants were Yishmael and Eliezer. What is Yishmael doing here, seeing as he had been expelled from Avraham's house?
Toras Moshe (21:6)): This shows that, by this time, he had returned (with his wife
Why did Avraham go to the trouble of chopping wood and carryung it with him? Why couldn't he rely on the wood that he would find at his destination?