[Iarwain Ben-adar]

1. Angband
2. Utumno
3. Lake Cuivienen (birthplace of the elves)
4. Two Lamps (before the Two Trees)
5. First realm of the Valar (before Valinor)

Those are what you want to know the location of. I will give a detailed description of the location pf each place.
Angband

-Location Angband is located in the Lands North of Beleriand. It is approximately 130-140 miles North-west of Thangorodrim. Directly to the north of Angband were the Ered Engrin (The Iron Mountains), and Dor Daidelos (the Regions of Everlasting cold). It is approximately 415-425 miles South-west from the Firth of Drengist (a Firth is a wide inlet of the sea). As the crow flies (a straight line) it is approximately 26-2800 miles from Aman.

Utumno

-Location utumno, also known as Udun, was directly north of the great lamp Illuin, which it was closer to compared to the Great lamp Ormal. Compared to ormal, it was still North of Ormal, just farther away compared to its relativeness to Illuin.. It is Protected by the iron mountains, and the Isle of Almaren is South of Utumno, in the Great Lake. Everything seemed to be in a line then. Here is the general order from Northernmost (top) to southernmost (bottom):
Utumno/Udun
Iron Mountains
Illuin
Great Lake
Isle of Almaren
More Great Lake
Ormal
And all around of this flat world was the doors of night.

Lake Cuivenien This lake is the awakening place of the Elves. It is located near the Inland sea of helcar (actually, near its Eastern bank). it is somewhere either in or on the edge of the wild wood, which is approximately 800-1000 miles from middle-earth, or Endor. The wild wood is, on its North-eastern edge, surrounded by the orocarni, the Mountains of the east. So, we can conclude several things about the location of this lake:
1) Located in or On the edge of the wild wood
2)surrounded by the Inland sea of helcar and the orocarni.
3)It is in the east
It is also in the Palisor, the Midmost region.

The locations of the two lamps is hinted at in my explanation of the location of Utumno.