Question

Hello,

Which version of NTW should I purchase? Additional packs? I am new to the game.

Thanks.

Doesnt matter that much, as long as you buy the base game, you can buy additional content on steam

The DLC with units are IMO not worth it, since you can get much more unit, and better quality, from the various mod here.
The Peninsular DLC is more interesting, since it brings a new map and no mod can do that.