Install ruby on apache debian GNU/Linux 3.1(Sarge)

hi ppl,
how can i install ruby on apache debian GNU/Linux 3.1(Sarge)what do i
need to add or edit on the apache2.conf i’m just learning the language
now. i already downloaded the following apache2, ruby,
postgresql-client, libopenssl-ruby, libpgsql-ruby, libapache2-mod-ruby
using apt-get. i been searching google, this forums. i can’t seem to
find anything. did i forgot any other package for ruby.
thank you very much for your help.