This project shows how to make and mill out a simple box out of plywood. If you want to get some inspiration on some other designs for joining wood and other materials together, I would recommend taking a look at the Make Magazine's CNC Panel Joinery Handbook.
This box is made of 5 pieces with 2 sets of identical pieces (front&back, 2x sides) and a base.
You can use CAMLab to generate the gcode from the STL files: camlab.sienci.com
Here are some recommended settings if you're using plywood:
- Tool: 1/8" flat end mill
- Step down: 2mm-3mm
- Feed rate: 800mm/min to 1000mm/min
- Plunge rate: 250mm/min