the uv mapping for the door has to be done.you better larn about before texturing ,because uv mapping is the base of texturing. to know about uv mapping u could see or read some tutorials. u try these sites out to get anything about uv mapping. https://www.learning-maya.com/texturing.php#uv https://www.mtmckinley.net/ they are very good tutorials . they give u a basic idea of uv mapping.