As with any board you come on to with help... You'll find a lot of good guys here...
also welcome
I haven't been here that long, but many people have helped me with small issues that I've had with my TD along the way.
But again, if you take a look around you'll find on the main have a FAQ section with information on how to get started with basic diesel tuning... and then there is search feature of the site. Or if you have a few hours to kill, just start reading posts in this section... and it'll answer many of your questions.
Lots of good info on here... you just need to spend some time looking for it. Chances are the questions you're going to ask have been answered, and all you have to do is look.
Enjoy!