Congrats, dude. Yes, your life, at least how you've lived it until now, is over. No more spur of the moment trips to Vegas, no more unplanned sex romps whenever you feel like it, and you will wonder where all your money went.
But there's some good tips in this thread. I'll tell you to get involved, but don't be a helicopter parent. Step up when your kids need it. Be a man, those dirty diapers don't change themselves. If you have a son, show him how to treat women by how you treat your wife. If you have a daughter, show her what she should look for in her own mate by how you treat your wife. Oh, and buy a shotgun, you'll need it sooner than you think