Unit Type Cost
Infantry 100x2
Armour 200x1
Artillery 200x2
Anti-Air 100x2
Total: 1000
My strategy will be to deny power projection, weaken incoming waves, and hold the line with infantry and a reinforcing Armor unit; or conversely use the armor unit to pave a path for reinforcing infantry units while denying power projection and weakening the enemy with artillery units behind friendly lines. So all in all, 2 Infantry Units, 1 Armor unit, 2 Artillery Units, and 2 Anti-Air Units.
I just thought I would make that public for your sake [member="Tamara"], though if it was intended to be private, I will adjust my starting army as I see other people's strategies.