Use mouse only.
Select a prefecture (region).
Click the Save button twice to save.
Hire soldiers by selecting a soldier type on the left side bar and click on your prefecture
Move your army by dragging the mouse over your soldiers and click on one of the arrows which appear.
Build labs to increase your soldier type and strategy.
Drag the 'hold' icon to command your army during combat.
Click on 'hold' icon to automate attack.
When you run out of options, simply click 'Finish Turn'.
Use the bar next to the mini map to zoom in and out.