[quo]*Quote from * whitefang
well i already know the basics but i don't really know what to start with either kanji,hirigana or katakana? can you please tell me what would be best to start with among these three?[/quo]
In order to know how to read Kanji you probably should learn hiragana, and katakana. I say "and" because really hiragana and katakana are just the same thing except "spelled" differently. If anything of the Japanese language would be considered an alphabet, it'd be hiragana and katakana. They both are characters sets that each character has no real meaning, but only describes a single sound that can be pronounced only one way. A better way to describe the difference between hiragana and katakana is that katakana is more like the _italicized_ form of hiragana if you will. In most cases the characters resemble each other, but have a slightly different look.
Kanji is a bit more difficult and each symbol has a variety of readings and meanings that are attached to it when used in different contexts and when applied in compounds. Overall they could be considered what might be the "words" of the Japanese language.
I hope that may help guide you towards deciding which character set you'd like to start with. Most follow the order of learning Hiragana, then learning Katakana as an extension of Hiragana. From there they use HIragana and Katakana to learn how to read and understand kanji.
However, I'd like to point out your Rocket Japanese Premium grammar lessons will teach you HIragana, Katakana, and Kanji. Kanji is more thoroughly covered as you get into Premium Plus and Platinum lessons, however you learn Hiragana and Katakana as early as the first grammar lessons. Another site to check out though would be readthekanji.com, Hiragana and Katakana and the first 100 or so kanji are free to learn, but from there it becomes a subcription services.
I hope this helped,