Widgets L4L On Hand Lead Time Gross Requirements Scheduled Receipts On Hand Net Requirements Planned Order Receipt Planned Order Release Wadgets L4L

I need to know how to complete the MRP tables, I don't know where to start and we don't have a book for guidance. Attached are the excel files the first being the BOM and the second sheet being the tables I need to complete. I need this assignment completed, please and thank you!