Anime freak is a good site to watch it in dub or with sub.
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You can download One Piece anime episodes at Soul Anime. They do have English subtitles.
I'm almost positive you can buy the movie at FYE or SUNCOAST. You buy it, then there should be a languages link in one of the menus. You can watch it in Italian with English subtitles or just watch it in English!
You can't. One Piece is still being made, and according to the author it will be continually released for a long time to come. In English, you can read 61 volumes of the manga. Also, 205 episodes have currently been released in English, with 206-263 being released at the start of summer of 2012. In Japanese, you can fine 540 episodes with English subtitles. Depends on how much free time you have, I guess.
Movie2k.com
there are no One Piece episodes that have been dubbed in German.