I'm going to be really mean here. TV is calling
~~~The VERY basis outline to diplomacy~~~
1. Hatshepsut
a) Punt
2. Thutmose III
a) Battle of Megiddo
b) Tomb of Rekhmire
3. Thutmose IV
a) Mitanni Princess
Note that diplomatic relations occured later with Hat, Tut III and Tut IV. Prior to this, Egpyt took on a more militaristic foreign policy as they had to prove their power once more after the "humiliation" of the Hyksos occupation. It was only later when the government was stabilised that they could turn to diplomatic relations. That's definately not enough to write for an essay, but they're the essentials.