I have found interesting tutorial about making your own Web/Mail or FTP server. For that you will need good connection and leave computer online (if you want server to be online). Best off all is that you don't need to worry about Space (its your HDD) and Bandwith (depends on your ISP). If you have small amount or limited upload/download that could be problem.

Tutorial is not easy for beginners but anyone can try ofcouse
Anyway i think this is the great tutorial.

[Tutorial Link]

Enjoy