You can figure taxes at about 33 to 35%, but that is before you have taken any deducions. You are allowed a deduction of your spouse, as well as children, if you are providing their support. Any of your expenses with working as a nurse, such as cost of magazine subscriptions, conferences, scrubs
or uniforms, work shoes, socks, stethescope, etc. are considered deductions and can be taken off of your income when calculating taxes.
If pad that salary every two weeks, you should see about $1000 per check. But again, it depends on the number of dependents that you are declaring etc.