Wanting to start knitting - things i need to start? like what sized needles and what not :D?

i am a self taught crocheter so i have decided to start knitting as well, what are the essential things i need to get started? i see more knitting patterns then crochet so i though, hey why not! seems like fun but a little difficult, but hey! im up for a challenge! :D thanks for all who answer my question! :DD