Multiple sites & VPN

Hi

I've got a 1GB service and I want to use it as these ways:

* A VPN for myself

• various ruby sites

• various python sites

• various PHP sites

• 3 SSL Certificates

• lots of DNSes (connecting Mailgun, etc.)

• lots of sub domains

• my own Git server(for backups and not paying Github anymore for Private Repos)

• A Git for updating all those PHP, Ruby, Python sites without any headaches

• …

Are these possible?(There is no server pressure)

Any advice?

Thanks in Advanced

I'm currently reading everything necessary to my question, but your answers can guide me.

So don't hesitate to help me!