Here are some Youtube Links that will guide you to basic videos of Sketching -
http://www.youtube.com/watch?v=knvbqsN7gF4
http://www.youtube.com/watch?feature=fvwp&v=1xkNYdAmn1s&NR=1
http://www.youtube.com/watch?v=ka2PoDDyBi8
http://www.youtube.com/watch?v=_inysX9AXcg
Below in the forum you can post any new videos that other viewers might find helpful!
http://www.youtube.com/watch?v=knvbqsN7gF4
http://www.youtube.com/watch?feature=fvwp&v=1xkNYdAmn1s&NR=1
http://www.youtube.com/watch?v=ka2PoDDyBi8
http://www.youtube.com/watch?v=_inysX9AXcg
Below in the forum you can post any new videos that other viewers might find helpful!