To the Japanese speaking VIPPERs here (seems like most of us):

I've mastered hiragana, and it'll take me about a week to learn katakana (and about one week more to use it freely like hiragana). I also know some basic Japanese syntax and grammar, but I don't know any kanji. What does VIPPER recommend to do now, start learning grammar extensively, or learn some basic kanji, and take up grammar a bit later？