Getting Started

I am a mechanical engineer and have mastered the three cad side of design. I use to write g code 30 years ago when i was in undergraduate studies. I'd like to get a small cnc router like the 6040T but I haven't a clue where to start. Looking for help. I am slightly confused. I know I need a controller and a software for the controller like mach4. I bought an older computer with an 32bit os and a parallel port because I've been reading that I need a parallel port and a usb doesn't cut it. Please help. Can someone please suggest like a bill of materials and software?

Regards
Bill Johnson