How to make a 3d model from a sofa

This is my sofa :

The blue area is where I want to make a 3d model from . I want to make a UV map from it and apply a texture on it .

to do so , I think first I need to make a 3d model from this area . Am I right ? if so , How can I make a 3d model from it ? if I'm wrong ,could you tell me what are the steps and how it's done ?

King Regards