Hi,
I am new to the texturing world and have read and watched hundreds of tutorials.
I am having trouble with one area and that is merging photoreal textures together to make one texture.

image also found here https://www.facebook.com/aalborglufthavn/photos/pb.120377818028521.-2207520000.1399054075./616551045077860/?type=3&theater
i am trying to recreate the black/greyish roll up door on the far right corner.
I have found the neccessary textures on cgtextures.com but I am not sure how to make the textures blend in together.
Is there some tutorial I should watch or read regarding layers?
Also does anyone have a recommondation how I can recreate the glass in photoshop? maybe using bevel and shadows and some other tools?
I work with photoshop for all make textures as the textures do not have to high resolution.
any help appreciated!!
Philip