[TYPO3-english] Looking for Tutorial for own compatibility extension

[anybody]

At the moment the extension compatibility6 is an important feature, but with the time I do not need all the functions, but I expect that I need one or two functions for longer time (e.g. some deprecated config features).
Is there any tutorial for making an extension by a clean way which contains just some selected features from compatibility6?
[I am not a programmer - I understand PHP only a little bit]