You will have to live with this forever. If you choose something someone else already has or even something close, you could be in for legal troubles. As you get a book ready, don't try to edit, typeset or design it yourself. Don't design your own cover. It will sell your book.
Nothing looks worse than putting out an amateur looking book.
That will kill your company overnight. There is so much to learn. But be patient. Don't expect to start selling your books tomorrow. I started in 1998 and won't have my first book on the market until 2000, but that doesn't bother me.