Complete the Germany Timeline as we go through the course.
Mr Budd History has an excellent page full of powerpoints, videos and other materials that can help you understand this period but at GCSE level. You will need to read beyond this in order to get up to Pre-U standard. Nonetheless, these resources provide a good place to start.
The following video gives a reasonable overview of the key events that you need to know 1918-1933. It is not terribly detailed – more of a run through but still useful.