Getting an Order of Protection from the court. Keep a copy with you all the time. Give a copy to the police, people who take care of your children, their babysitters, schools, and your boss.
Changing the locks. Consider putting in stronger doors, smoke, and carbon monoxide detectors, a security system, and outside lights.
Telling friends and neighbors that your abuser no longer lives with you. Ask them to call the police if they see your abuser near your home or children.
Not using the same stores or businesses that you did when you were with your abuser.
Someone that you can call if you feel down.
Safe ways to speak with your abuser, if you must. Going over your safety plan often.