You can roll the money to an IRA at a custodian of your choice.

Sounds like you need very concrete instructions. Assuming you are interested in doing the most financially efficient route, this would mean maintaining the tax advantaged status of the 401k money.

• Go to Vanguard.com, Fidelity.com, Schwab.com
• Pick one of the above.
• Click through to open a Rollover IRA (or Traditional IRA). Write down your account number.
• Click through to transfer an external account. You will enter in your 401k information. An address will be supplied to you. KEEP THIS ADDRESS.
• Go to your 401k.
• Choose: A direct roll over
• Provide the IRA account information that you just opened. Provide the IRA account number.
• Provide the address for the 401k to mail the check. Sometimes the 401k mails the check to you and then you have to mail it to your IRA.

Call your IRA's 1800 phone number if you run into trouble or confusion or if you don't know what to do next. All of them have people who will sit on the phone with you and walk you through everything, step by step, click by click.