@ Lucius: Units of infantry are four bases, and chariots two, so it depends upon how many figures you want on a base! I have four on a heavy base, three on a medium and two on a light, because my figures are all based for DBx, but you can do what you want, as long as they fit in the squares you choose. I tend to use 15 – 20 units a side, because that's what I've got. You can go down to 6 – 8 if you want, which is where I started. The rules have a points list so you can balance armies, but I didn't want to be prescriptive, so use what you've got. The City States changed their army composition based upon need, any way. Typically I have 2 or 3 carts aside, then 10 -12 heavy infantry, a couple of mediums like massed archers, then enough lights to screen the front of the army.
@Kent Reuber : Minimum 8 x 6, better on 12 x 8.
OB has done a good review over on his blog: link . He has then done a follow up, talking about using them for late Bronze Age.
My blog is here: link where you'll find battle reports and more on what I think I'm playing at.
@gavandjosh02: That is annoying. I'd have though .jp would have shipped. It is listed on .co..au, but is labelled as "not in stock". What about .com?