Ok, you must learn to train the units then actually buy them. it costs money to learn to train them also. everyone starts with $500. here is each groups starting stats and the list of units
UNITS
you don't have any of these units, but they are available. you start with spearman, archers, and swordsman. just learned, not any available though
spearman-units cost 20 each
archers- units cost 25 each
swordsman- units cost 30 each
mage- learning cost 100 --- units cost 25 each
longswordsman- learning cost 120 --- units cost 35 each
gunsman- learning cost 120 --- units cost 30 each
halberiers- learning cost 90 --- units cost 25 each
mounted spearman- learning cost 180 --- units cost 50 each
mounted halberds- learning cost 180 --- units cost 50 each
you may train:
armour
speed
swordsman
ranged units
helberds
spearman
Orcs of the North
Orcs of the South
Humans
Wood Elves
Night Elves
Mountain Trolls
Demons
Men of the West