Firstly, are you modelling with polygons or NURBS? With NURBS, you'll just have to tweak the projection until it looks right (or create the texture accordingly beforehand so it looks correct when projected onto the model).
If it is a polygon, you will want to do a UV Map of the object, then map the texture over it (in Photoshop or a similar program). There are PLENTY of online tutorials which cover UV mapping, as well as a few really good ones available right here on SM!
"Ad astra per aspera..."