To create your own certs:
cd files
openssl req -config /etc/ssl/openssl.cnf -subj '/CN=*/' -x509 -days 3650 -batch -nodes -newkey rsa:2048 -keyout logstash-forwarder.key -out logstash-forwarder.crt
The logstash configuration files are some samples for beats, if you want to use other configurations you need to store them in:
/opt/logstash/config /opt/elasticsearch/config /opt/kibana/config