A selling agent, or sales agent, is essentially a real estate agent who specialises in selling property and who receives a commission upon the successful sale of a property.
To lawfully act as a sales agent, any person selling property must hold a real estate license in the state in which they operate.
As an investor it's essential to always remember that a sales agent ultimately works for the vendor and their fundamental goal is to secure a sale. It is considered a conflict of interest for an agent to act for both the vendor and the buyer and so you should not expect financial or investment advice from a real estate agent.
However, a sales agent can still be a useful contact that can help you find out about trends in the local property market and alert you to properties that may be of interest.
A real estate agent who is also a QPIA member will have the qualifications to better understand your financial goals and circumstances.