Prop Creation Help

I’m trying to find a program that will let me make my own props for use in GMod, but I’m having trouble finding them. Yes, I’ve tried searching for it, so don’t link me to Google. The only program I can find is something relating to chemistry. Can anyone help me find one or direct me to such a program?

Try to model it on any 3D progam “3ds max or Z3D modeler” and find how to convert them for MDL in valve format.