How to create the flowchart on Visio????Please help

The following describes the customer order processing procedures for Gina Company Upon receiving customer order in Sales Department, salesclerk enters the order information into the computer. Computer prints two copies of "order-acknowledgement" and "picking list" (picking list contains product data such as number, name, the number of units ordered, and the location of the inventory in warehouse) Salesclerk signs the documents and sends a copy of the "order-acknowledgement" to the customer and a copy of the "picking list" to the Warehous e Then, salesclerk attaches a copy of "order-acknowledgement" and "picking list" to the customer order and sends them to the Billing Department. They are filed in the billing department until the goods are shipped In Warehouse, after the goods are picked and are shipped, shipping data are entered in computer Computer updates inventory and prints Shipping Notice in two copies - a copy is sent to the Billing Department and the other copy is filed by date with "picking list" The billing clerk upon receiving Shipping Notice, compares the customer order to the shipping notice, enters the data into computer, and prepares two copies of Sales Invoice through computer. One copy of the Sales Invoice is mailed to the customer, and the other copy is filed in Warehouse with the Shipping Notice by date Requirements: a. Prepare a system flowchart for the customer order processing procedures described above b. Prepare a dataflow diagram for the customer order processing procedures described above