The most taught thing to say is はじめまして。よろしくおねがいします。<formal> Hajimemashite. Yoroshiku onegaishimasu. Kinda like... Pleased to meet you or how do you do. The second sentence is more like.. Let's join hands. There are, of course, other settings. The <standard> is はじめまして Hajimemashite The <casual> よろしく or よろしくね Yoroshiku or yoroshiku ne This, like I said earlier is implying "let's join hands" this is used when you're going together with someone. the Ne is kinda like adding an "okay?" To the end of it.