Platoon leading
The platoon commander is usually in charge of the entire players force on one team in at our sessions. Ideally as platoon commander you should be possess considerable experience as both a fireteam leader and squad leader.
Your primary job is to produce the plan and coordinate the platoon through it in-game. Your plan will have been created with anticipation of the enemy's most likely course of action. Ingame you will adjust the execution depending on causalities and what the enemy is actually doing.
You shouldn't overly micromanage your subordinates but instead trust them to make the best decisions based on your plan. You should do your best to adhere to the princpiles introduced in the leadership section of the fireteam leading article.