1The Lord had said to Abram, “Go from your country, your people and your father’s household to the land I will show you. 2 “I will make you into a great nation, and I will bless you; I will make your name great, and you will be a blessing.[a] 3 I will bless those who bless you, and whoever curses you I will curse; and all peoples on earth will be blessed through you.”
This is the first time God speaks to Abram, yet there is no introduction like "Hi, this is Yahweh or El Shaddai speaking" (see Gen 17:1), no foreword that Abram was a righteous man, similar to what we find with Noah "for you have I found righteous before me" (Gen 7:1), just "leave your country and people and I will make you great". The obvious question is: Why does Abram deserve all this?
In Gen 17:1, for example, God tells Abram "walk in my ways and I will make you a great nation". This makes a lot of sense. But leaving one's country doesn't seem to be a good enough reason for a god to bestow all these blessings upon Abram; and besides, Abram was heading to Canaan before god told him to do so as is evident from 11:31, so this was not much of a big deal for Abram. It would seem more appropriate if chapter 12 started with something like verse 17:1, which includes a proper introduction, that is name of the particular god speaking, and the basis of the covenant "you walk in my ways, and I in turn will bless you". However, the first time god reveals himself to Abram, he receives a very cold introduction, and the covenant god makes with him seems to be unconditional, that is without any expectations of Abram to walk in his ways or do anything to deserve his blessing. Why doesn't God (or should I say the biblical author) ask anything from Abram before promising him all that, or at least explain why he chose Abram from all the other people out there?
Introducing one's name seems to be the protocol in the rest of the bible. See for example Gen 28:13 and Exodus 3:6 where god first introduces himself to Jacob and Moses. However, this question is only secondary to the main question (of why this covenant is so different) as there are some exceptions to this rule.