Hi,
Look at the How-To for the Yourduino Microcomputer Starter Set:
http://arduino-info.wikispaces.com/YourDuinoEngStarter
(The product page is HERE: )
There are pages on Servo, Stepper Motor etc.
Over 1000 Students have used this low-cost kit in beginning Engineering and Computer Science courses.
Feedback, Critique, comments on the how-to welcome! to terry at yourduino.com
DISCLAIMER: Mentioned stuff from my own shop...