Pretty simple micro

Skirmishers

Light line / Levies

Heavy Inf / Phalanx

Cav (as reserve) w General

Missile trops at the flank


Never group, but just sort them. Controlling the skirmishers first and set all other infantry in guard. Then attack their line with the light after skirmishers was spent. After that, the heavy infantry took place. I rarely use cavalry, except to attack another cavalry.