Lika Lula said but a slightly longer version:
National Level:
Pingisligan
Superettan
Division 1
Division 2
Division 3
Regional level:
Division 4
...
Division 7
You'll find the pros in Pingisligan and the up and coming cadets in Superettan. The other national leagues are fairly similar but with the obvious difference in skill. I believe that TTD Tom has been playing in both division 1 and Superettan.