Writing a Book

Last night I stayed up late, wrote some poetry, and looked through my computer files to see if there were any unfinished pieces that caught my attention.  What caught my attention were a few finished children's books I wrote - I have no idea what to do with them.  A few years back I searched online for some publishers that accepted manuscripts and I sent my stuff in, and never heard anything back.  It would be so amazing to publish a children's book, but I honestly do not know where to start.  Maybe I'll put it on my list of things to do for this summer (which is rapidly growing).