You appear to have grasped the important bits already. You should get a handbook with your set from the operator which will explain the rest e.g bidding for work (which is something I've never had the opportunity to do), the history of your jobs (which needs to be cleared occasionally), volume control, the stupid sat nav which if pressed accidently is a swine to get rid of imo and try as I might I still haven't found any games
It's easy to use and don't forget to learn how to lock it or you'll be pressing more emergencies than soft joe 
If it is locked you can't accept jobs until you unlock it but it's pretty easy to do and you shouldn't miss accepting a job. Sometimes it gets a bit sticky depending what the reception is like but if you move your vehicle when this happens it should clear itself when pressing the 'pay' button. I wouldn't take the suggested fare it gives you either as accurate 
