I'm about to get the keys to my new, Dutch home in a few months. It's a newly built apartment which comes with approximately 30 square meters of backyard that's free for plants, and a bit of front yard as well. Right now, both the back and front yard are just a building site, with dry brown sand/dust everywhere. I know the natural soil state of the place is dry, acidic and infertile, because of the heath and pine tree forest that's just across the road. So I know I have work to do to turn this into more fertile soil and a lush green garden, but I have no clue how to start doing this, and when/which season is the best to start this, or when I can start putting in plants.
I have already determined I want a lot of plants, and preferably also a big variety of plants, in my small garden. I'm not exactly sure what kind of plants yet, but I've been thinking about edible things (blackberries, strawberries and some herbs), pretty things (I really like clematis and butterfly bush, but also bulbs like tulips and narcissus), and insect-friendly flowers ('weeds') with an insect hotel. Most of what I will eventually plant will probably depend on what kind of environment I can realistically create though.
I've found a source suggesting it can take over a year for 'ground life' (like rain worms) to reach 'healthy' levels, and to not plant anything before that had happened. But it wasn't mentioned how to recognize "healthy", though it makes sense that there need to be some worms in a healthy garden. What I can find about turning a building site into a garden with good soil quality seems contradictory and biased, probably because this is mostly from companies or people that make their money in gardening/landscaping.
Sources seem to be divided into two camps: the first suggests to dig up the top layer of ground, as it will be compacted by heavy machinery travelling across it, and contain a lot of small bits/pieces of (inorganic) building material. They argue getting rid of it because otherwise, water won't drain well through very compacted ground and result in flooded pavements and rotting plant roots, and it's a good way to get rid of all the inorganic debris. The other side suggests that just dumping a layer of compost and putting plants in is sufficient. Digging everything up would increase the risk of pavement tiles moving out of alignment as the soil underneath them settles. Sources seem to suggest that ~30cm of compost would be enough, and can be dumped on top without the need for digging out other ground first.
I would love to do as much of this process myself, though if it's really necessary I can get a professional with their equipment to help out. But right now, I have no clue where and when to start, and I'd love some (hopefully independent from money) advice. So: For a new apartment built in an area with originally dry, infertile and acidic soil, what are some good guidelines with regards to when and how to start turning the building site into a more fertile soil for a garden with a variety of plants, and at what point I can start planting plants?