If you haven't talked to a lawyer, that's next. He can tell you everything you need to know.
Basically, she (or her lawyer) will (eventually) file a motion for child custody, and you will get a letter telling you when you have to go to court. Eventually, she will file a motion for child support and alimony pen dente lite ("temporary alimony while divorce is proceeding"). Same thing, you'll get a letter.
Another way to go is to agree with her to hire a mediator. This is far more cost effective, if you are able to come to agreement. Lawyers are by nature adversarial, mediators will help you come to a mutual agreement. They will allow you to decide for yourselves, whereas if you wind up in court, the judge will eventually decide for you.
M:23 T:26 Me:53, Wife: 60 S:18 D:16 filed 7/16 W moved out 4/28/17