Sell additional Goods that you have at your Brick-n- Mortar Store now
Sell Products that are known as Drop-Shipped (Non Inventory Goods)
Online Courses or Training
Advertisement or Brochure type site
The whole process of getting a website up and running all depends on your expectation and how much you are willing to put into it. Meaning it is not very difficult to do the layout and the design aspect but the content is where the most critical aspect is.