The job duties of a real estate sales manager involve working to supervise agents and give them the resources and support to sell or lease properties. Your responsibilities may include providing sales training, coming up with sales strategies, implementing those strategies, providing support for agents to promote listings, and communicating with clients to help close a sale or facilitate a purchase. Depending on where you work, you may focus on commercial or residential properties or both. Your real estate firm or investment firm may sell properties or rent them.