Spend this interim time planning your transition into a new life.
Remember that divorce is always a horrible business so keep yourself healthy, both mentally and physically, and familiarise yourself with the stages of divorce and the processes involved.
Find a good divorce lawyer. Make a few appointments. Ask them any questions you have.
Will you be selling the family home? In which case, start getting it ready to sell. You can call this "decluttering and tidying".
At some point, you might even suggest moving, to sound him out about selling the house (without informing him that you would be splitting).
Work out what your financial position will be. Take advice if you need it.
Think about where you will live after the split. Look at your options.
Think about how you will break it to the children, and how you will tell your DH that you are divorcing him. Imagine what that will look like and what you might say. It really helps to visualise yourself in these scenarios and to almost role-play them in your head.
If you have any concerns about his behaviour, take advice from Women's Aid, and by all means speak to your local police to flag up that you are ending your relationship and are worried about his reaction.
Use this time to prepare yourself. And remember - one step at a time.