[TYPO3-english] how to start new extension?

[Santiago]

Hello,

all tutorials about extension development are based on kickstarter - but that 
extenstion fails with deprecation error.

Looking at my php.ini - deprecation is excluded from error
and I did not find a configuration setting in t3 where I can turn off that 
errors.

So how can I proceed - or what is the right way to start with a new extension?

kind regards

Santiago