Create Security Certificate with Webmin / Usermin

I have ever visited http://www.webmin.com/faq.html and question 14, then
I run the following commands :

1,openssl req -newkey rsa:512 -x509 -nodes -out cert.pem
2, cat privkey.pem cert.pem > /etc/webmin/miniserv.pem
3,openssl genrsa -out key.pem 1024
4,openssl req -new -key key.pem -out req.pem
5,cat key.pem cert.pem > /etc/webmin/miniserv.pem

to create our own security certificate, but I found I can't to define
the key version, the size ( eg : 1024 Bits )
of key and the valid date of key etc !
So, can you help me to solve this problem ?

Thank a lots.



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