This package does not ship with rules. For it to do its job, it must have
rules. Rules can be used from a couple places. It knows how to use
snort rules if you have those. But if you don't another place to get
rules is the emerging threats web site. To install, you might do
something like:
mkdir /etc/suricata/rules/emerging
wget http://rules.emergingthreats.net/open/suricata/emerging.rules.tar.gz
tar -xz -C /etc/suricata/rules/emerging --strip-components=1 -f emerging.rules.targ.gz
Then enable the rules in /etc/suricata/suricata.yaml