Make a Terrain in Unity

Material: Link

Go to Assets Store and Add

1. Outdoor Ground Textures

2. Conifers [BOTD]

3. Grass Flowers Pack

Open Unity Hub Create 3D Project

Goto Windows and Package Manager 

Download and import Assets

Crete a Terrain

Give Texture

Draw Trees 

Draw Grass

Add Grass

Create a vehicle

Put Functionality to Vehicle