First off, "my" is not a phrase.
わたし + の + item
Depending on your gender and social status, there are various ways of saying "my". The standard, one-size-fits-all phrase is "Watashi no + item", which works for all genders and all social levels.
White when translated from English to Japanese is shiro for shiro means white
Chocolate is 'chokoreeto' in Japanese.
Dog in Japanese is 'inu'.
Domo.
Sakarerumono
Koibito.
Yonbanme
何 (nani)
daibu
SugoiSugoi
Hajime mashite?
Sumimasen.