While we don't mind answering some questions please don't expect us to do your job for you by answering the same ones that have been asked 1000s of times over and for which all the answers may be found with a bit of reading in the Panerai section. I suggest you follow the advice given and do some reading for yourself. You will never learn anything unless you do the yards by doing some research.
The fact you need to ask if a trusted dealer is reliable tells me you have not done any reading here, you have not even browsed the forum but are simply posting questions. All will be answered by spending a couple of hours reading and you just may learn something to boot. If you can't be bothered doing that you can't want that watch that bad after all.