Please phone RoW on Friday. I also recommend Gingerbread 0808 802 0925 They are a charity who support single parents and have a helpline for exactly these questions re access rights, contact, etc
I understand that you are panicking, but leaving without fully exploring your options, may not be in your best interests. Solicitor's vary in competence and experience, it's why I'm pushing you to get a. advice from RoW as I know they are experienced in DV issues and very good at what they do. b. a solicitor experienced in DV as they will know how to handle your husband.
Phone Gingerbread today and you can ask all the other questions you have regarding separation. They cannot give legal advice, so I would wait for Friday.
Start looking for somewhere to move and research removal companies. Some provide a packing service so they'll come in and pack everything up for you which may prove useful for a fee.
I'm sure that since you've already organised a safety plan, that you have a bag packed up and hidden away or with someone, should you have to flee and that you've got access to and copies of all relevant documents pertaining to the house, finances and everything else relating to the divorce.