hey man great start, but seeing your experience, i think you really should start with poly modeling, it would be good for box modeling, much easier! try to get some ref pictures if you havent yet! And for the texturing, your gonna have to learn UV mapping, so then you can put up textures using photoshop! Try going to

https://www.digitaltutors.com/digital...ideo.php?v=156

There should be a tutorial on that texturing request of yours, not sure!

well good luck man