Active Directory and VPN on single server setup

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http://serverfault.com – I've attempted this several times now and never got it exactly correct. I am looking to setup my ML5 server as a VPN Server, Domain server, DHCP Server and file server. However every time i have attempted this I've read different ways of doing it, all of which never work and always miss something out. The network has a single Virgin Media Modem, all features turned off so it is just a modem with a tplink router hooked up to that, the server has two different network cards installed both directly connected to the router, then there are several wireless devices, a 360 and a PC all of which re (HowTos)