I don't have access to LOME - but I do have access to LK's Army Builder. Nazgul are on a seperate list all on their own. Does this mean that Nazgul don't count as leaders?!

What about the named ones?

The first model you select is your leader, so select the Nazgul first.

I'm afraid that I'm still confused

Would a list like this be legal under LOME:

The Shadow Lord on Dark Steed
Orc Warrior w/ spear-12
Black Numenorean-12
Morgul Knight-6
Orc Tracker-14
500 points

All the troops are from "Minas Morgul" and they don't have a "Minas Morgul" leader.
Can the Shadow Lord count as their leader? Can a normal Ringwraith?

Correct me if i am wrong but you first select your leader from you main contingent (the main army you choose) then you can ally. All allies need a hero from their contingent. so i don´t think it is legal under LOME to have a Nazgul to lead an army of anything but Nazgul. What you could do is to make a nazgul army then use one of them to lead the army (named or unamed) then you could ally ine almost every model from all the evil armies. I don´t hace my copy of LOME right now so i might be wrong

Any Nazgul can be your leader, so yes, the Shadow Lord can be you leader.

However, that list is not legal. You must have a hero from each contingent (in short, you need a hero from Minas Morgul as well) .

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"There are few left in Middle Earth like Aragorn, son of Arathorn." - Gandalf, Many Meetings

You are wrong. There is no "main contingent" or "main army", that's a common mistake. Each list is a contingent, hence each needs its own leader. The first model chosen is the army Leader, so you can choose a Nazgul to lead, but you can't ally with everything, because each list has to be able to ally with every other.

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Coordinator of the Great British Hobbit League

srry my mistake

Well theres one exception though , Khamul, he is in Easterlings army respectivley and can be their army leader Strange though that Witch-king of ANGMAR is not listen in the Angmar army

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I am the Mouth of Sauron, here him speak'

I understand now - I have to bring an Orc Drummer, Captain, etc from "Minas Morgul" and then I can ally in a Nazgul (cause they're from their own list). I was just confused because the WK doesn't count as a leader for Angmar (and Khamul does for Easterlings...) so none of it made much sense at face value when I was trying to figure it out.