[Twisted-Python] spawning tasks after reactor?

Hi, I'm new to twisted and have a simple question. I want to run a threaded server that monitors a remote service and spawns queued/threaded tasks as it finds messages. I'm having trouble understanding how to do this after a reactor is running since the tasks are not set up before reactor.run(). I see reactor.callLater(). But I want to spawn the task immediately. I tried: reactor.callLater(0,self.some_method,object) but the method is not immediately invoked. It seems its not invoked at all. I want to create a high-performance threaded scheduler using twist. Any tips? thank you! Darren