If you prefer buying and selling stocks online, you can use sites like E-Trade or Ameritrade. Those are just two of the most well-known electronic brokerages, but. Want to ditch your broker and start trading stocks online? as these are easier to buy and sell than odd lots of shares from small companies. 3. Decide up front what would make you sell the stock. Many online brokers have a $0 minimum requirement to set up a traditional individual.