at lvl 1 u get bonus hp
at lvl 2 u can chose to get bonus dmg or def
if at lvl 2 u go atk:
at lvl 3 u can chose to get bonus hp or bonus dmg from light armor
at lvl 4 u can use two handed wepons (axe, club, sword) and u can chose 1 kind witch get bonus to dmg
at lvl 5 u get bonus dmg
at lvl 6 u can promote your footman to barbarian
if at lvl 2 u go def:
at lvl 3 u can use all kind armors (light, medium, heavy) and u can chose 1 kind witch get bonus to def
at lvl 4 u can use shields (heavy and light) and u can chose 1 kind witch get bonus to def
at lvl 5 u get bonus to hp
at lvl 6 u can promote your footman to knight
if at lvl 3 u go in light armor (def or atk branch)
at lvl 4 u can chose to use bow too ( if u do, footman can only use light armor )
at lvl 5 u get bonus to speed
at lvl 6 u can promote footman to archer
barbarian later could be promoted to berserker
archer later could be promoted to scout, royal archer or crossbowman
knight later could be promoted to heavy knight or paldin
i hope all is clear. sry for bad english , but i try do my best.