have you seen a solicitor yet, and have you told him what your fears are about the children, its ok you saying that your partner wont agree with anything the courts or you both agree with, but she will have to, remember you have rights too, stick with what you are wanting and if its right the law and the people will be behind you 100%,
some of us have been in the same place as you are and its frightening you dont know what to do or where to turn, its great us giving advice on how we got through it and we did but in the end its the courts and the solicitors that are there to help you both,