that web has the best tools for learning jap like anki, memrise, kanjidamage, etc etc All you need is pretty much there. and you have a huge advantage, knowing all the kanji beforehand because many of them have the same meanings in jap and chinese! Maybe you don't know the onyomi and kunyomi but actually knowing the meaning is really important.
My recommendation is start learning the kana<----katakana and hiragana then the grammar which is the most important thing and then vocab, with memrise or anki start learning jplt 5 then 4 and so on