How to generate a client side certification

Hello,

I would like to create client side ssl certification autorisation on certains page of my website. I already have “normal” ssl on my server. It’s certified by godaddy, and working great. Godaddy gave me a gd_bundle.crt and a other .crt file, not totally sure on how, but after a lots of try, I did managed to create a .pem file and a .key file. Thoses two file are on my haproxy. On my other server I use unsigned ssl since they only communicate between themself.

I would like to know, how do I from those file, create a pkcs12 file, and if possible one different pkcs12 file for each user, and do I use the haproxy ssl file (certified by godaddy) or the web server ssl file (uncertified)?

Thank you

Ps. All my server are on debian and my webserver are on apache2