hi
i never tuned any car\truck,i have a small background about tunning
i want to buy a tunning program to tune my truck with a laptop, and i want to tune my friends trucks

my truck is a 2009 gmc sierra,my friends have 3 2008 sierras,2 2008 silverdaos,and 3 2009 sierras.
my goal is to start with simple tunning, like speed limter,tq mangment,spark advance,and rev limter and shift points..and ill learn more from this site and from other tuners

what kind of options i have,can i upgrade the tunning program to tune more cars\trucks if i got better with it.
the eflive site isnt that obvious and i didnt understand every thing in there