Can my wife and I get an uncontested divorce if we have kids?

We want to pursue an uncontested divorce because we don’t want to spend a lot of money on legal fees. We’ve agreed that we will sell the house and split the proceeds, and how to divide our personal belongings. We also wrote up a custody agreement for the kids, and the only thing we don’t completely agree on is how much my wife should pay in child support. She runs her own business and makes more money than I do. I went online and saw that there is a form I can download to file for an uncontested divorce but it says we have to have a signed marital settlement agreement. Other than what we wrote about custody of our kids, I’m not sure what else we need to write down. What do we need to do to get that agreement and file for an uncontested divorce here in Philly?