Hi OP
I am a former family law solicitor. I hope I can give you some help.
You don't have to disclose your address if you fear that your ex will harass you. In your divorce petition, you can give your solicitor's address for service. There is no specific form to request confidentiality, but you can make a general application to the court that your address be omitted from any documents served on your ex. Your solicitor can help you with this and depending on the judge, can be dealt with on paper rather than you having to attend.
If he applies for an order under the Children Act 1989, it is Form C8 that you need in order to keep your address confidential.
As someone else has said, you need to be careful about what your children might say, especially if he is going to put pressure on them. If he has been very abusive, supervised contact (with a member of contact centre staff listening in) might be preferable to avoid disclosure.
As for the non-mol, it depends really. If he is abroad, the court is likely to think that realistically he will not have much chance to come round. However, the order covers other forms of harassment, including by phone, email and text and could be granted to cover this. However, there would need to be recent ongoing harassment. The biggest hurdle is getting the order personally served abroad. It does have to be served in person and it can be very expensive to instruct inquiry agents. In addition, the court would need to fix a date for a return hearing, which seems pointless if he is abroad. For that reason, I would probably advise against it at the moment. However, you can still make contact with your local police station so that they are aware and can make sure that you are a priority should anything else happen if he returns.
I hope that helps a little. Feel free to PM if you need further guidance.