take a look in the unity Asset Store, there are a lot of great and free models and otherstuff:
https://www.assetstore.unity3d.com/en/#!/search/page=1/sortby=popularity/query=category:0
or make your own eg. with Blender:
take a look in the unity Asset Store, there are a lot of great and free models and otherstuff:
https://www.assetstore.unity3d.com/en/#!/search/page=1/sortby=popularity/query=category:0
or make your own eg. with Blender: