Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
On install of Debian, select no packages to be installed, allow it to connect to the internet and let it download anything it needs, usually its libs etc. Exim is most likely installed at this point so dont worry it will be removed shortly.
1).vi /etc/apt/sources.list (add the following sources)
deb ftp://ftp.uk.debian.org/debian/ stable main
deb-src ftp://ftp.uk.debian.org/debian/ stable main
deb http://security.debian.org/ stable/updates main