I have been study Korean and Japanese both at the same time and I use manga to help me with some of the grammar and particle usage in Japanese. I brought a book called " Japanese in Mangaland" and it was a big help to understand Japanese a lot better. Do you use manga/anime to help you study Japanese? Comment down below.
"Any fun way is the way". Run away from any tedious or boring learning systems. Be like kids, there's always something silly about life. If you are learning hiragana and katakana try a set of books call "Kanji de manga". That's a cool idea to learn with japanese cartoons. White rabbit from Japan have also a big poster with the most used Kanji characters in Japan(about 2,000). But don't worry, most children's and initial reading books are written in Kana(hiragana+katakana together). Good luck