You don't say what company you work for, but have you thought about asking a friendly dispatcher if you could shadow them for a few flights? Most of us are happy to show people who are interested what we do. It would mean giving up some free time, but would give you a proper insight into what the job involves, and look good on your application! It might also give you the chance to meet the people responsible for selecting the new turnaround managers and that can only be a good thing. A lot of your skills as cabin crew would be very transferable to dispatch, and if you got the job, you would be trained in the ground systems and procedures. Go for it!