Hello and welcome!
As Pete mentioned, editing the Aircraft.cfg file will make the planes show up where you want them to in the aircraft menu. The key entries to look for are:
ui_manufacturer=
ui_type=
ui_variation=
As far as the textures are concerned, I've had some success with using the "copy and paste" method of transferring textures from one model to another. I've also used textures from photographs that I've taken of various aircraft.
My photo editing program has a "select area" or cropping tool along with a "move area" tool which allows me to copy part of an image and place it exactly where I want it on another image. If you have Photo Shop, I'm sure it has similar features.
One word of caution: If you decide to use someone else's texture file or a downloaded photo for this purpose, it is important that the newly created textures be for your personal use only, or you may be at risk of violating the copyrights for the materials used!
Good luck!
