Agmar isn't all too flexible when it comes to rushes. Really all you can do is build thrall masters or wolves at the start. I suggest you build a mill and then 2 halls of the kings men. Start training thrall masters and try to avoid building gungaband wolf riders as on option. They are expensive and weak.

Then when your thrall master exits the hall you can create Rhudur axe throwers. Keep building thrall masters and Rhudur axe throwers until you have 6-8 battalions. Send them to destroy enemy resource buildings. Do not send only a couple of battalions because like orcs, they are weak and rely on numbers for their strength.

Later on, about mid-game, build hwaldir to create leadership for the axe throwers. This should make them very powerful to all but dwarves.

Rushing with dire wolves could also be a possibility although I don't recommend it. If you decide that you want to try this out then my build order would be :- Mill, Troll and wolf den, dire wolves, mill etc.

This would prove some use against factions like mordor and goblins. Once again, I would prefer the axe thrower strategy

How to survive with angmar mid-late game

Building the troll hero Rogash late game is a must. He owns everything. Another great unit that could be built late game are dark rangers and upgraded snow trolls. Avoid sorcerers as much as possible as I think that they are a waste of resources. Upgrade your rangers with ice arrows to devastate your enemy. Angmar requires a large economy late game and if this doesnt happen you may end up camping. Expand as much as possible and keep your enemy under control.

Having control of the map of angmar is vital like I said. This can sometimes be hard if you don't know what your going to do next. Maybe the below suggestions I have made will help your decisions.

In terms of defence. Angmar is very flexible when it comes to fortress upgrades and walls. Angmars walls can also be upgraded making it the only evil faction with upgradable walls. Buy the dark flame power for your fortress for 500 resources to provide leadership to the units surrounding it when you are under seige. The witch kings sceptor (I dont know the name) is the fortresses most powerful upgrade. Its very much like mordor's gorgonath spire except it shoots out a burst of ice wrecking havoc onto a large area. Its a good idea to save up for it.

Legolaim's unit profiles:

The thrall master (100) gives angmar its cheap units. You really have no option but to build these early game. The thrall master can build gungaband warriors, Rhudur pikemen, Rhudur axe throwers or gungaband wolf riders. The most viable option would be the axe throwers. The pikemen are untrained and find it tough taking down even cavalry. The orcs are the cheap option for angmar's infantry and I wouldn't really use them personally. The gungaband wolf riders are expensive and can die easily.

Dire wolves (250) are a relatively cheap and fast infantry option for angmar. They would do alright on the battlefield but try to avoid buying them late game as they would be weak against upgrades and cannot be upgraded themselves.

Snow Trolls (750) are the advanced cavalry unit for angmar, very interesting, and they can move swiftly on the battlefield. They are a bit pricey though at 750 resoruces. Its great to sneak these monsters to the sides of the enemy army and then bash them to the ground. Just try to avoid pikes. When at level 2 they get a powerful charge ability which is a bit like the dwarves charge ability.

Hill trolls (600) are angmars most elite pikemen. They can deliver the most crushing blow to enemy cavalry. Much like the maruders. This is a must get for late game as your enemy is nearly garunteed to have cavalry by then. Just keep them away from archers and upgraded infantry though. Hill trolls can be upgraded with heavy armour and iron blades.

Black Numenorians (400) are the elite infantry unit of angmar and can also be upgraded. They have 2 interesting abilities. The bull rush and the death masks. If you have the money to spare late game then these would be an option. They only come in battlions of 10 and are rather pricy for what they are. They will eat up your money if you can't afafford them. If you don't have the money, stay away.