Marsel,
My sympathies on the bad news about losing your job!
To roll over a 401(k) after losing your job, there are a few steps to take:
#1 - Decide where you want to open the IRA into which you'll be placing the rollover.
#2 - Open the new IRA account. Let them know that you intend to fund the account with a 401(k) rollover. They should be able to give you the new account number for the so-far-empty account.
#3 - Contact the 401(k) plan administrator, and request the forms to roll over your 401(k). Depending on the details of the plan, this may be a separate rollover form, or it may just be a standard distribution form and you must specify that it is going to a rollover.
#4 - On the 401(k) distribution/rollover form, have the 401(k) made payable DIRECTLY to the new IRA account custodian with the new IRA account number. This should allow the 401(k) to go directly from the 401(k) to the IRA, and there should be no withholding.
You can also complete a rollover by simply taking a distribution from your 401(k), and re-depositing it into an IRA within 60 days. However, if you receive the 401(k) funds directly, the plan administrator will withhold 20% of the distribution for potential taxes (they don't know if you're doing the rollover for sure!), and you'll have to make up the money out of pocket to complete the rollover and then get the 20% withhold back later when you file your taxes. So the bottom line is that the direct rollover option I detailed above is preferable, since you don't have to face the withholding complications.
I hope that helps a little! Best wishes to you in this difficult environment!