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who knows how i can create a workflow without weeks to build? like a bleuprint.
Welcome to the Atlassian Community, @Mario Klein !
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Creating a new project creates a workflow for it, which you can then edit. Or you can copy an existing one that's closest to what you want. It's very rare admins create a workflow from scratch, almost all of us copy and edit existing ones. Even the most complicated ones only take a couple of hours to get into shape (it's usually the really clever stuff that takes the time - advanced post-functions that reach out to other systems is the usual thing that takes a while)
I like to copy existing ones and then editing it. If its too complicated of a workflow( you should avoid this :-) ), then I usually draw it on paper or an app and then build it from there. Maybe this guide below can help guide you. how-to-create-workflows/