A tutorial to start with CentOS 6.5?

Server
7 
  ./letsencrypt-auto certonly -a manual -d example.com \
  --server https://acme-v01.api.letsencrypt.org/directory --agree-dev-preview

Only I have to run this on the server?
Where it says I must put the example.com domain?

SSLEngine On
SSLCertificateFile /etc/letsencrypt/live/example.com/fullchain.pem
SSLCertificateKeyFile /etc/letsencrypt/live/example.com/privkey.pem

After putting him up in SSH I put him down with the domain name and it works?
Just adding this longer works?
It seems very simple.

Thank you.