I don't how good you're at self-studying, but I would've never gotten anywhere with Japanese without taking a few courses at my university first. Taking any kind of course will force you to get involved and talk with people, and even if the course is crap, you'll be learning *something*. =P
Here are a few sites that I've found amazingly helpful:
Great site for grammar
Slightly less awesome, but still good site for grammar
Good page for learning kanji







