How do you add texture to a brick,plane (ect)
Add a material.
A material is a shader plus its input values and is applied to the render component. You should read the Unity user manual. It's full of useful information about all parts of the game building process.
Put the texture image in your assets folder and then drag it onto the bottom of the inspector with the desired object selected.
More info about textures:
http://unity3d.com/support/documentation/Manual/Textures.html