Lost central management GD-sections afte V2 Update

Thanks Guust for your quickly answer. But this does not help me. I have read everything and have understood the draught. The following questions:
1. If I put the location side in the setting on my list homepage, it remains empty. If I do not put this setting, central management is also indicated.
2. How I can assign the Widgets without central management sections
3. How I can edit the Template of the homepage of the central management, so, for example, the Sidebar-Widgets
Thanks a plumb line for your support

Other problem:
On the location page becomes in the single entries and categories verlinkt. Everything these sides also do not function. I am really helpless here 🙁

http://www.sandstein-concept.de/zertifizierte_installateure/

Hello, Alex, you have really read my Posts? Many thanks for the great links which knows of course in themselves and whose contents I have also read. I have read the Docs. I understand the draught and in version V1 everything ran excellently. Nothing goes almost to V2 after the update! Hence, the reference to your Start-Tutorials do not help me. Result please of the URL of my last Posts and does not say me why all that any more functions. I would also like to have no GD-Widgets on my normal WP pages. I would like to have GD-Widgets exclusively on central management pages, as well as it was before in V1. Under "design”-> "Widgets”; I can assign the Widgets just not to the suitable GD-Templates, because these central management sections are not indicated at all. . . see Sceenshoot of the first Postings. . .