Configuration of a OS X Server on distance

I have a small company (6 mac computers) and a want to configure a OS X Server for the company needs. All available services needed for a small company should be configure. For exemple: - Profils administration (acces from and out of office) - Messages - Documents share - Web sites (your web sites from 2 external servers should be migrated to the local server - Time machine - Program update - May be mail and calendar - Proxi service so that my colleagues can pass through the server and act in internet as from the office - Other useful services for a small company office Please bit on the project only if you have successful experience with OS X Server. Some small maintenance period should be included in the offer.