Use ALL alternate picking.

Marc Seal is a great teacher and has studied at GIT 
(Guitar Institue of Technology) and has, for the past 
several years, had hour long internet streaming video 
lessons available.  It was a really cool idea. (over 100 
hours total)

They became so popular that they are moving to a 
new site and will be available again to watch and 
learn. For more info, check out his website and look in 
the forums for details. Highly recommended for any 
style or skill level.

http://www.digevent.com/events/consumer/music/gu
itar_mania/index.asp