Child support is a calculation based upon income. That being said, the income is capped at the first $9,200 per month. So even though a party may make considerably more than $9,200 per month, the court will typically only factor that amount in setting child support.
For one child, support is 20% of that number, with another 5% for each additional child. If you have other children from a different relationship that you support, that will be a part of the equation as well.
Often, one party will want custody of the child on a primary basis, requiring child support from the other party. This can be a litigating factor that has a tendency to cause court proceedings when the non-primary party does not want to pay child support. The non-primary may seek a 50/50 custody arrangement for the child in an effort to lessen child support.