I have 4 children....5 and under.

My rules are;
Go with what works.
Dont leave the house unless you have too
Buy two of everything (so you dont have to pop out for milk, bread etc).
Stay on top of your washing....i do 3 loads of washing every day
When babies in bed...do something for YOU - even if its for 1 hour of a night...
Buy a slowcooker
Get as many cuddles as you can throughout the day
Learn to love coffee...
If someone needs you, drop what your doing. Housework, phone calls, paying bills, belly belly....can all wait till the evening....
Enjoy it - they arent little for that long.....and then you will enter yet another parenting learning curve....