Land Rover Discovery 2.5 1992 Problems with drains

Good morning. My father who has died recently left me his Land Rover Discovery 92. The best moments of my childhood were in that JEP. How you can imagine this grandfather with wheels has some problems. And perhaps the worst in these moments I know the water leaks. To understand this car how extra ecological has when it rains outside also does it inside
Later I hang the photos of the current state. I want to get involved in the restoration of the car myself because it has a lot of meaning for me. They help me?