a bump map is lets say u have a pic of a wall all u do is make it grey scale and just save as a psd name it wall bump so u know what it is. then just apply it to ure texture of lets say ure wall.in the bump section. easy as that.
dark is protruding in. light is bumped. (The colours of the greyscale)to make a specular map its the same thing just into the specular option in ure initial texture attributes. make it grey scale too. but an easy way is to maybe blur the grey scale and up the contrast slighly that should show u how it works kinda.

Edit** not specular i mean displacement section in the attributes
but its the same process.