Too many variables to explain in a thread - go to boondocker's website or send them an email - pretty sure they can email you a manual. Basically, you are piggybacking your factory mapping and either adding or subtracting fuel from different points. Tuning with a BD box takes a bit of time and patience, most maufaturers of aftermarket stuff (example pipes) will give you starting numbers, but it is up to you to tune from there. Now would be a good time to brush up on how to read plugs and piston wash, and install a set of EGT's as a tuning aid. Bear in mind that EGT's are NOT absolute.
Read the manual, check the site. My dad uses one on his Dragon, seems to work although Im not really sure what its doing. Kinda like a chip for your truck I guess