My Unity has no presets

Maybe it is because I don’t have the pro version, but when watching others videos they seem to have lots of textures, pre-made objects, vehicles, trees etc when going to load them, but I have none, do you have to create them yourself or do they only come with the pro version?

You have to import them through the Projects pane by right clicking and going to Import Package and selecting the package you want to import.

The assets come with tutorials or resources downloaded from the Unity 'site :

There are some packages like this : Terrain Assets | 3D Vegetation | Unity Asset Store

Search the asset store, that is the main collection of paid and free assets.