Hello all, I am very new to production planning

Respected all,

I am a new profile holder on this network,  Previously working as  a Inventory Analyst in SAP. I am starting my responsibilities as a production planner by next week.  I will require your great assistance to be successful in being a production planner. My first question for the day is

How to create items, sheeting routes and bill of materials.

Thanks, I will highly appreciate your response