How to automatically start your service after install?

Add the following class to your project.

using System.ServiceProcess;  

class ServInstaller : ServiceInstaller
{
    protected override void OnCommitted(System.Collections.IDictionary savedState)
    {
        ServiceController sc = new ServiceController("YourServiceNameGoesHere");
        sc.Start();
    }
}

The Setup Project will pick up the class and run your service after the installer finishes.