An e-commerce website will be exactly the same thing as a retail/wholesale store but online.

That will include:

• Login for your customer.
• Shopping cart.
• Price levels (retail, wholesale, discount …)
• Method of payment (Cheque, Money Order, Credit Card, Purchase Order)
• Order form
• Packing slip
• Tracking number
• Invoice
• Inventory control
• Synchronize online shopping cart with QuickBook
• Taxes control for different provinces and country.
• Catalog
• Automatic email notification for every event on the shopping cart.
• And many more.

An e-commerce website will improve accuracy and save time and money.