[First c10]

Hey guys. I am working on some type of step by step plan to tune my own ECM.
I bought hptubers VCM Pro and have a wide and ordered.
I really haven't found what to or how to start. I think maybe it is self explanatory after you have done it. But I have a few questions

1-what engine/trans information is needed before you start to tune?

2-Best to change 1 thing and resave the tune each time?

3-What is the sequence for flashing the ECM or "flash calibrate only".
a-Flash ECM.
b-After uploaded shut ignition switch off for 30 sec? And than start engine?

4-What is the 1st thing to check or change?

5-When looking on YouTube I seen a few tuning videos on "LNF" what is LNF? Is this the same as how we would tune a NA stockish engine?

Ok I am sure the answers to these questions will pose more questions.
Thanks in advanced.
Scott