get private to decrypt

Someone gives me a public key.  How can I get private  key to decrypt?  Is that step called SIGN KEY?  
Thanks.

 gpg -r NAME --output OUTFILE --decrypt INFILE.gpg
ewang1205Asked:
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abbrightCommented:
By default you create a private/public key pair. You keep the private key secret and distribute the public key. Someone else can use the public key to encrypt messages to you which you can decrypt using your private key.
If you don't own the corresponding private key you may ask the sender for it but likely he doesn't own it. Rather create a new private / public key pair, send him the public key and ask him to re-encrypt the data using your public key.
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ewang1205Author Commented:
Thanks.  I ike create a new private / public key pair.  

Is the public key and private key same ID?  All I need is the passphrase to decrpt?  
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abbrightCommented:
I believe the ID of your private and public key are the same.
In order to decrypt you need your private key and the corresponding passphrase.
In order to get some experience you may want to create a simple test file, encrypt it using your public key and then decrypt it again using your private key.
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ewang1205Author Commented:
Thanks.
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