What is the "Reishis Bikurei Admascha" to which the Torah is referring?
Wheat, barley, grapes, figs and pomegranates, olives and dates.
How do we know that the prohibition of cooking meat and milk extends to animals other than goats?
Rashi: Because the word "G'di" pertains to every young tender animal. 1
Since the Torah uses the term "G'di Izim" to describe a kid-goat. See Sifsei Chachamim.
What do we learn from the three times that the Torah repeats the La'av of "Lo Sevashel G'di ... "?
Rashi: We learn the prohibition against cooking them together, eating them together and deriving benefit from them.
Why does the Torah add the word "ba'Chaleiv Imo"?
Rashi: To preclude a bird, (which does not have mother's milk), from the Isur, and which is only Asur mi'de'Rabbanan.