Basically, what others have said. Rosetta Stone is great for quickly learning very basic conversational language, but it pretty much stops there. And you'll get a good amount of rudimentary vocab, but not the ability to form it into sentences correctly.
Also, considering Japanese uses 3 alphabets different than our own, you'll probably want to study some of that, and you'll get none of it from Rosetta Stone.
If you just search "learning Japanese" on YouTube, there are tons of folks (many westerners actually living in Japan) that talk about the various ways they learned/taught themselves. You can get a good range of experiences through them and see what might work for you.
One other bit of advice is that immersion is incredibly helpful learning any language, so find an Anime or a show in Japanese that has a ton of episodes, and just start watching it in Japanese with no English subtitles while you're learning. Music in Japanese is good too. You'll be amazed at the things you start to pick up on, and it's also a solid way to check your pronunciation against native speakers.
Good Luck!
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