VCarve Desktop will not create designs larger than 2 foot by 2 foot. you have to move up a level to make larger projects. I use VCarve Desktop because my machine is small.
VCarve will create tool paths for 3D shapes when you import 3D .STL files. However, VCarve cannot design 3D shapes. For that you would need something like Vectric Aspire. Because I do a lot of models for 3D printers, I use other software to create my .STL files and I don’t bother with Aspire.