We congratulate you on your becoming Muslim. When it comes to declaring and showing your Islam, all you have to do is go to the Masjid and tell the Imaam about that, or tell one of the Muslims, so that he will take care of telling others. Thus, the people of your locality will find out that you have become a Muslim, and they will interact with you accordingly. This is what happens with everyone who enters this great religion. The Muslims’ hearts are filled with joy when they see the new Muslim proclaiming the testimony of truth and starting a new life which takes him out from the darkness of disbelief. As for changing your name on your identity documents and other official papers, you can follow the regular procedures in accordance with the law of the land in which you live, which requires you to check with the civil registration office or the government department that is responsible for such matters.