Not all agents work the same way. The most important attribute of an agent is that she is well connected to the real estate industry. She should know the market and provide information on past sales, current listings, her marketing plan, and at least 4 solid references.
In addition, you also want to look for an agent that is honest, assertive, and one that best understands your needs.
Try to go with a local agent. They can better serve your needs because they should be more familiar with the local market conditions, local prices, and what’s hot or not in your community.