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I personally never study Kanji like that, since many kanji can have the same exact reading you only end up confusing yourself, well at least I do. I like to learn them in compounds, it helps so much because you're actually learning them how they are used. Now yeah you don't know all of the readings right away but as you learn more words just make sure you check the kanji for those words, if you know the kanji just not the readings, then it's time to learn the new readings for those kanji since you are now learning that new word.

This is simply what I've found works for me, but if you find learning all of the readings right away works better for you, then do that. The best thing that you can do though is try out multiple methods of learning and see what works best for you, well anyways good luck! And if anyone else has some nifty ideas on this subject I personally would love to hear them!