I'm relatively new to HP-UX myself, and believe me, I know how hard it can be to dig the info you need out of that big a load of information. Still, it's the biggest single resource I've found on HP-UX so far. If you're looking for more of a beginners guide, maybe this'll help.
http://www.docs.hp.com/en/B2355-90164/index.html
It's available for download as a PDF. And this should give you a handle on the shell environment.
http://www.docs.hp.com/hpux/onlinedo...355-90046.html
Hope those are more help to you.