The learning curve can be steep with Tuning.

"A Tiger can kill an Elephant . . . One Byte at a Time" is a good approach to learn tuning.

For the first Byte I recommend is coming up to speed with TunerPro RT and record a data log.

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Basic Steps: (about a dozen mouse clicks)

Download TunerPro RT (freeware version available) to a laptop and configure screen views.
Purchase an ALDL cable.
Install ALDL Cable Driver
Configure COM Port, with ALDL cable plugged into the laptop.
Load .adx definition file into TunerPro RT, available in the link in post 2.
"Start your Engine"
Start data scan.
Record data.
Go for a test drive
Stop recording at the end of the test drive and save .xdl file. "The Hello Tuning World moment"