Which garden outdoor works are possible before moving in?

It can be useful to cultivate the areas with soil-improving plants for one season before the actual garden setup. That means plants that break up, loosen, and enrich the (often compacted) soil with humus and/or nitrogen. For example, you can use lupins, mustard, or Phacelia, which are very inexpensive at agricultural suppliers or at the central warehouses where farmers buy their seeds. If you let a gardener drive over the property beforehand with his large rotary tiller, the effort for sowing is minimal, and depending on later use, the gardener might also have a suggestion on how to incorporate the green manure into the soil afterward (e.g., with a spade machine or a small plow). If you want and can plow (or instead of the gym wield your own spade): the frost action in winter produces wonderfully loose garden soil.

It can be useful to cultivate the areas with soil-improving plants for one season before the actual garden installation. That means plants that break up the (often compacted) soil, loosen it, and enrich it with humus and/or nitrogen. For example, lupines, mustard, or phacelia can be used; they are very affordable from agricultural supply stores or suppliers where farmers buy their seeds. If you let a gardener drive over the property beforehand with his large rotary cultivator, the effort for sowing is low, and depending on later use, the gardener might also have a suggestion on how to incorporate the green manure into the soil afterward (e.g., with a spade machine or a small plow). If you want and can plow (or instead of the gym swing the spade yourself): the frost ripening in winter creates wonderfully loose garden soil.

Very good idea, thanks for your detailed answer. I'll start researching right away. :) I will have to google the term frost ripening.

I just looked myself at what Google spits out. Before you turn it into a scientific paper: The soil is roughly dug or plowed in late autumn and left over the winter. Water penetrating the clods freezes (multiple times) and loosens the soil, so that in spring you find nice loose soil as if by magic.

I also did not find any reasonable software tool for garden planning. In the end, I bought Din A3 pads, one with graph paper and one with tracing paper, and colored pencils. I then traced my property + floor plan onto the tracing paper and "designed" on the graph paper with pencil and colored pencils as best as I could as an amateur.

A rough plan is sufficient. For almost all plants, a size range is given and then they don't stick to it.

A rough plan is enough. For almost all plants, a size range is given and then they don't stick to it

And even if they do stick to it, in the next X years everything will look different anyway than in the final size ;)