I found a detour how to make it but not this is not perfect.
I also didnt understand The Zero Subtotal Checkout feature and i tried another way:
1. disable The Zero Subtotal Checkout feature
2. enable “Checks and Money Orders” and rename the TITLE to something like “click for continue to see your product list ....” or whatever.
actually you have to modify some words in translation (In-Line Translations tool) and email templates to fit this process to your needs.
now, my issue is how to remove the quantity option because my site should fit to real estate needs.