Dial In Server On Rh Linux 9.0

Hello! Guys I have been given this task to implement or in fact configure a dial in server as in ISPS Now here is the description What I want to configure is a Remote Access server (RRAS in windows 2003) so that my users of which have their accounts on my server can dial in from a remote location using PSTN and then get 3 facilities 1. Files on Local LAN 2. Internet which is available on the server and on the local LAN 3. Emails that are o the local intranet like my own domain Now I have to configure it on Linux 9.0 The problem is that I have worked with Linux but not to that extent I really need you help here Please tell me which server I need to configure for this requirement And where can I get more information about this same thing This thing has to be done as soon as possible and I have to do it all on my own Your kind help is deeply appreciated Thanks