Hp tuners has their own forums. Great resource.
and there are a few pretty complete tuning guides out there.
look for the cpig tuning guide.
http://ls1tuningguide.com/files/free...UP%20GUIDE.pdf
http://ls1tuningguide.com/tuningmanu...ons%20rev3.pdf
Both of these explain things pretty well. and should get you well on your way to a good tune.