Marketing yourself is a big key in finding the correct agent, you need to find a person who is going to meet the needs of your music. So, look into an agent that books similar bands to yours. It can also be very helpful to have played many different shows. Agents are in the profession to make money, with most earning commission between 10 percent and 20 percent for their services.
This means someone who performs live a lot is going to be more ideal for them, allowing you a pick of agents. Most importantly, being the opener really opens up doors for you when looking for the best booking agent. An opening act is a popular and relevant act that is going to be very appealing to an agent.