AES and Credit card number encryption

[Tobiah]

I browsed this subject and thought I might use the
'AES' cypher scheme to do this.  Would this be
a good choice?

I came across a "Python Cryptography Toolkit"

http://www.amk.ca/python/code/crypto

which has a nice AES implementation, but in
the example, a simple string is passed as the
key:

obj=AES.new('abcdefgh', AES.ECB)

So my real question is, how do I go about
generating the best key.  Isn't the length
supposed to be a 2^n bits, and soforth?

Thanks,

Tobiah

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