One of the highest voted “best first language to learn” is Python ….
Do the 21 lessons at codeacadamy – http://www.codecademy.com/tracks/python
Or … here are some other tutorial sites. They all look good so choose one that suits you:
(This google one has a whole series of videos that goes with it.)
Online Python Distributions:
http://www.codeskulptor.org/ (can’t use turtle)
For Turtle graphics use:
t = turtle.Turtle()