So for the current way the game is played, what is essential or heavily advised for any army?

As far as I understand it, bows have become less of a focus?

And would I be right in saying that a Wizard or a Nazgul is absolutely necessary for whatever force you're fielding?

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Namarie

Spears. You should always have spears, but whether they go in 6 and 6, or in one big 12 is up to you. You don't need magic, but it certainly helps, it depends on who you are.

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"I am the Flying Spagetti Monster. Thou shall have no other monsters before me"
-FSM.