Some of the most popular items I model are rockets, and to be honest – they are not that difficult. The basic shape is normally a series of cylinders and tapers, topped with a cone!
There’s no doubt that it is possible to spend vast amounts on graphics software – many of the industry standard packages run to thousands of pounds, and even image editors like the full Photoshop are very expensive, (and come with monthly fees too).
But provided you already have a computer, it is possible to get going for little or even nothing. This blog post will explore some of your options.
Be aware though, that this stuff is NOT easy, and whatever package you go for, it will take considerable time and effort to master.
Blender 3d.
This is a seriously powerful 3d package, with some highly advanced features such as fluid simulation, and hair systems. It is completely free, and open source.