Importing a city model and Texture Mapping Problem

Hello Everyone,
Whenever I import a model generated in any modelling tool such as Blender.
With my model textures are not there. Secondly , something wrong with the size too. If I adjust the scale factor with large number i.e(5 , 6) . It’d slow my game speed. I’m a novice user of unity. Please help with a comprehensive answer and if possible suggest some tutorials that could answer many Importing problems.
Thank You in advance

You need to import textures separately. Nodes based materials are not supported. In the import settings for the model the scale is likely set to 0.01