I have created a walkthrough of the workflow I use when desinging a simple part.

Here is the part I will be making.
[ame=http://www.youtube.com/watch?v=v3ifr7OoVxg]KRMx02 Z Stop - YouTube[/ame]

Its a Z stop for the CNCRouterparts Z axis. This axis is used on the follwoing CNC machines:
CNC Router Parts CRP4848
CNC Router Parts CRP4896
KRMx02 CNC

If you are just getting started and need a little help, this workflow may be of some use. If you just want to make the part, the Gcode is available on the page as well.

CNC Workflow, see it here:
My CNC Workflow

Please, it was a long post. If you see any typos drop me a line.