Migrating web from shared hosting (I read some questions but they are no help)

Hi, there are a lot of questions about this topic, but none of them point at the questions I have. I’m migrating from hostmetro and I have a domain there. I’m following this guide:

https://www.digitalocean.com/community/tutorials/how-to-migrate-wordpress-from-shared-hosting-to-a-cloud-server-with-zero-downtime

but I’m stuck in the step 4: sudo nano /etc/apache2/sites-available/yourdomain.com

My wordpress is installed on the OS ubuntu 14.04 using the IP address I can access to it, so to install the old wordpress on the server, do I write where it says “yourdomain.com” my hostmetro .com domain? and on “sites-available” my ip address from digitalocean?

I’m also trying to transfer my domain, this guide includes that right?

Thanks for the help!