1 private plot with house construction, completely own garden design

One has to say yes to the will of others, otherwise one gets rudely confronted as to why one doesn't do it that way.

Nonsense. There are simply more differences of opinion about the garden here than about the house (at least from my side).

If the libraries are open again from 4.5, check if you can get the magazines "mein Schöner Garten". They usually present a garden in 2 variants with a plan and planting list, as well as a property with garden. Without planting plan, but sketched where what is.

Gräfin von Zeppelin has a good catalog with model gardens, subdivision of plants by location, etc.