Ask the 401K plan how much they will take out.  Or you have to tell them the percentage you want to have taken out.  Be careful, the distribution will add to your other income and may push you into a higher tax bracket.  So if you don't need it you can roll it into a IRA.

"I am over 59 1/2,,,,"  If you are OVER 59 1/2 then it is not early, and you are not subject to the 10% early withdrawal penalty.  Your retirement fund distribution will be taxed at your ordinary tax rate on your federal return and if retirement income is taxed in your state, at the rate your state has determined.

You will receive a 1099R in late January/early February which you will need to enter on your 2017 tax return.

 Go to  Federal> Wages and Income>Retirement Plans and Social Security>IRA  401 k) Pension Plan Withdrawals to enter your 1099R