How to launch renovating a garden?

A drop of a plum resin

       Now we have a house and a garden in the mountains. The previous master practically didn’t live here for more than ten years. We made some renovations in the house just to make it livable. But our dream is to make a beautiful garden. Here it wouldn’t be frozen to the roots in winter and would be able to grow at least ten months a year. In my dreams I see a house enveloped with the energy of trees and flowers, the house and the garden as two interrelated parts of our environment as yin& yang or turizas&anzus in Scandinavian runes.

      The trees continue to give fruits: pomegranates, pears.

      We found a lot of sweet grapes in the vineyard.

But the soil is extremely dry and covered with yellow grass. Plants didn’t get water for a long time.What to start with?

If you have any experience or have ever been in the situation like ours, please share  your ideas.I’ll appreciate it a lot ))