How to secure a slope and design a garden entrance cost-effectively?

Slope behind the house. View from the upper floor. I don't know how it will look yet. Cheap is not an option. The apple tree will stay.

This part will also only be created next year. The property is also not rectangular as is usual in new housing developments.

View from the children's room to our stone storage. Lawn and terrace will go there. In the background the old wall. A wall will be built at the parking lot/neighbor's property. The old cellar remains. There is also over 1 meter height difference from the house to the boundary.

The area in front of the house
We had 120 cm filled in so that the cars fit into the garage.

I have many ideas. Whether they are low-maintenance and affordable is still questionable.

For the slope, I saw a really nice system from LA. I estimate 50 or 60 thousand and then into the round file under the table

Phew, you really still have quite a bit ahead of you! I am curious, when the area behind our house is filled in, it will be easier to estimate what needs to be done in the garden.

Is it then relatively flat with you or not

Relative. I have to see if I can find a plan with elevation details. So we naturally don't have a flat garden behind the house either, but it only slopes moderately. In the picture you can see the terrace area.