Here you find links to the First Premier League (1. Bundesliga). Here are also links of the second league (2. Bundesliga) and the regional league (regional-Liga). The second league is divided in Nord (north) and Süd (south). The regional league is divided in four regions, like Regional-Liga Nord (North), Nordost (Northeast), West, Südwest (Southwest).
The german associations with many links to other lower leagues, you can find in the section german associations. Most pages about the clubs are in german.
To spare me some work, I left the comments in german.