Let me tell you now, whatever you do, don't give up. Don't change your ideas for anyone, and get a few people you can trust to check your work before presenting it to any publishing company. If your grammer is not done well enough, they will most the time trash your book proposal to the side. Be the fly on their wall that won't stop bugging them, and never let then tell you never. J.K. Rolling was let down by a lot of people, and look were she is at.