Creating the 3D model is just the first part. To make a decent job of it you need to have a good understanding of everything that goes into a typical FS aircraft. This includes the panel, textures, flight dynamics & so many other little things too numerous to mention.
My advice would be to start out by designing or modifying panels, repainting textures or one of the other aspects of the hobby. This won't cost you anything & is comparatively easy to learn. It will also give you a good understanding of the skills necessary to create a decent complete aircraft. Most of the established FS aircraft designers started out in this way. It all takes time to learn & Rome wasn't built in a day.
