Hello skoleboss, and wellcome to Stellwerksim.
Actually there is not too much communication required. Going left track ("GWB" for "Gleiswechselbetrieb" is the German term) should be avoided if possible. Some layouts (Stellwerke) have multiple connections (like "Hbf1, Hbf2"). It depends on the particular train which ones you can use (destination, connections in the neighbour layout, etc.). As a basic rule, you should always communicate before you send a train anywhere else then scheduled. People appreciate that.
When a train is delayed, it is indicated in the timetable automatically, so your neighbours can see that. The delay in minutes is given in brackets in the last column called "Verspätung". If it's negative, the train is ahead of schedule. You can also give a reason for the delay if you want: right-click on the train in the timetable and choose "Verspätungsbegründung", but that is not mandatory.
Please feel free to ask questions on the chat in English. Most people in Germany know at least a little English. I think it's a shame, that there's no English manual yet. But there is a little glossary here on the forum at
http://www.stellwerksim.de/forum/viewto ... 92&t=23027.
The hardest layouts are usually the goods yards ("Rbf" - Rangierbahnhof) such as Seelze, Bremen - Burg, with a lot of shunting. The busiest passenger station probably is Amsterdam CS, but Nürnberg or Leipzig Hbf are not bad either. The fictional layouts at Merxferri are quite busy, too.
Happy railroading, and see you in the stellwerk.