Konnichiha-Hello, but you should check japanese greeting system, it's much more complex than english one. You can use and "Hajimemashite" before introducing yourself to somebody. Watashi ha X desu. - My name is.. OR Watashi no namae ha X desu. OR you can simply say: X desu. X kara kimashita!- I am from.. Yoroshiku onegaishimasu!- Nice to meet you! In this context "ha" is read as "wa". And on X places your should add your name or name of your country! Hopefully I helped you! :)

こんにちは、わたしは~~です。~~から、きました。

Hi, do you read the Japanese characters, hiragana and katakana?