I am a long time single mom, my boys are now 22, 19, and 13 and we homeschool. What I have done is to live day-to-day life much like it would be if there was a dad but he just never comes home.
You are not really going to be a single parent, their father is still a parent but he just isn't around. Being a true single parent involves issues that you won't be facing (dating, sex, long term goals, letting go of long term dreams, ect.).
Books about authoratative parenting may be of help. Kids under stress really need a mom with good parenting skills.