Yes a tutorial is welcome and it would help many people no doubt, but.... When I played GT5 I had no idea what anything did, besides an oil change and car wash. To be completely honest to the OP, the tuning part is one of the higher learning curves of the game, and frankly the only way you can really learn is to try it out yourself, immerse yourself, apply different settings, check lap times, thats what gave me some semblance of what to do. GT6 is a bit buggy so settings that would apply in real life and for GT5 are sometimes invalid now, or they are even reversed.
Though with GT6 like ^ post, no telemetry settings or raw data? Geez, thanks, its like I'm doing tuning in a third world country.
If you need help or issues with things, you could always post it as a question, as many bright minds and engineer aspiring tuner geniuses will be glad to help on GTPlanet.