[u]Always[/u] start at the beginning. If you know the stuff already, you'll breeze through it. If you don't know the stuff it's parmount to learn it before you can move on.
matonanjin2 above, wise he is. 
Welcome to GT and the Forum. Good luck, have [u]fun[/u].
"It takes a lot of devotion and work, or maybe I should say play, because if you love it, that's what it amounts to. I haven't found any shortcuts, and I've been looking for a long time."
-- Chet Atkins
-- Chet Atkins