To learn what your and your spouse’s child support obligations might be, you can use this child support calculators. Just follow (carefully) the instructions given for the child custody situation you are considering.
To use the child support calculators, you will need to know the gross monthly income (not your net or your take home pay, but your gross income before taxes and without any deductions) for you and for your spouse (if your spouse does not work, but is capable of working, you may want to use $1,257 as an imputed income; $1,257 is equal to a monthly income working full-time at minimum wage).