New building shell construction selection: Choose a company or architects?

It’s just that no one here can tell me exactly how it will turn out and what I should prepare for the first meeting or for an initial inquiry.

It's relative compared to the customer who doesn't have any concrete ideas yet

Furthermore, my ideas in the subtrades are also quite precise

Besides, I don't need help from the architect to read the development plan here.

By the way, I myself have concrete ideas about the living area and the design of the living space

in particular, I have made a floor plan sketch with area measurements in about 20 - 30 hours,

I can understand that it involves effort. Let's see how people react when I call there and feel things out. From my point of view, it is simply the case that I have an ideal plot of land with an exact south orientation. Ground level and relatively rectangular, rather a bit longer than wide. Enough space for neighboring buildings even if I were to plan with a width of 20 sqm. With my own construction planning, I am well below the restrictions set by the building plan, especially since the plot has a large area. Furthermore, I don't need help from the architect in reading the development plan here. By the way, I have my own concrete ideas about the living area and the design of the living space; in particular, I created a floor plan sketch with area measurements in about 30 hours, after also looking at numerous floor plans of houses of the same size and carefully thinking through my own requirements as well as those of the individual trades. In particular, there are also buffers for individual trades in case they turn out to be larger or the load-bearing wall becomes wider, or there is also the possibility to extend the building area. So the question naturally arises for me, if I use this sketch together with the area calculation and height calculation, where exactly is the architect's service compared directly to the construction company with its staff (who can also work out the later details with their architects). It is relatively different compared to a customer who still has no concrete ideas and possibly has a difficult plot, either due to location or building restrictions. Here, the high art of an architect is certainly often required. Moreover, my ideas in the individual trades are also quite precise. It is just that no one here can tell me exactly how it will turn out and what I should prepare for the first conversation or for an initial inquiry. Nevertheless, the criticism here has gotten me a bit further and has also motivated me to look up things purposefully elsewhere on the net or here in the forum. Thank you very much for that.

The next step would actually be to publish your sketches here in the forum.
If applicable, you might kill two birds with one stone.

You can use the collective intelligence and experience of the forum, and 1-2 architects are surely silent readers here who would be happy to get in touch with you.