Need help, setting up VPS and hosting and vpn

Hello, i need help setting up three things on my VPS:

1. openVPN
2. Hosting
3. rtorrent/rutorrent

I did setup these, but i am having problem:

with https://domain.com i see a openvpn login with www.domain.com i see my site with http://domain.com and with domain.com i get cgi error

Please tell me how i can setup all 3 things on my VPS and still keep all things away from site. Thanks.

VPS: Debain 7 64 bit, 512 MB Ram and 512 MB swap. Its ramnode