What type of computer are you using.... dos, win95/98, xp, or vista operating system.
I ask because TurboCNC runs in DOS.
I don't know what to tell you about the best cad/cam software to get that has easiest learning curve. Maybe others here on the zone will be able to help there.
Something else you might look into. Local vo-tech or community colleges that offer night classes on CNC machining.... just an idea.