This mod is balanced for VH/VH. so you`d try this.
If you play for the first time you should play one of the easier factions, to accustom yourself to the mod.
In my opinion the easiest factions are:
Mordor: A good starting position, good economy, good units.
Harad: A good starting position, economy needs a bit of work to work, units good but lightly armoured.
Rhun: A good starting position, economy great once you get mines, very good and diverse unit roster. Though, they have to fight the dwarves and dale at the same time.
If you don`t want to play with one of the easier factions, these factions offer some Challenge:
Dale: They have an good unit roster but have to fight against Rhun- Rhunic General bodyguards are an army on their own!
Isengard: They are surrounded by enemies.. Isengards Economy is good and their troops are cheap and effective, but with a bit of ill luck you might find yourself surrounded by Rohan and Eriador.
High elves: While quite easy, because they have good units and an secure starting position, they offer still some challenge because their economy sucks a bit.. And they can`t field as many units as other factions.
Silvan elves: They have good archers and with ambushes they can defend their kingdom quite effective.. But once heavy armoured units (Trolls..) appear they have some trouble.
These factions i woulnd`t play in my first campaign:
Gondor: I haven`t played Gondor in 1.4 but it seems to be a lot harder than in 1.3 to survive as Gondor.
Eriador: This faction sucks. Eriador is being redone- I would wait.
Rohan: If Sauron calls an Invasion on Rohan some players might find themselves in trouble. And while Rohan is good on the Battlefield, they suck during sieges.
Orcs of the Misty mountains: They are surrounded by enemies and their mountains are hard to defend.
Dwarves: They have good armoured troops.. But those are slow! Many players quit playing as the dwarves because chasing skirmishers is frustrating.