Is there a training manual for the Trader Workstation?

Übersicht: 

Yes, IBKR provides a Users' Guide for the Trader Workstation as well as our other trading platforms. The Users' Guides can be found on the website by clicking Support followed by For Individuals. Scroll down and click the User Guides icon.

Background: 

You can access the TWS User's Guide at the following link: TWS User's Guide. Should you decide to print it out there is also a printable version available, but please be aware that it is very long. Once the online guide has loaded, you can navigate through the guide with the "Contents" or "Index" tabs. For quick access to information on a particular issue you can use the Search button found at the top of the page.