Leaderboard

Correct, you should add all appropriate records. The most important will be the A or CNAME records for mail, www, ftp, and cpanel, and the TXT records for mail (DKIM and SPF). If you use webdisk you'll want to add that one as well. You can take a look in the cPanel zone editor to see what they should be. Keep in mind that if you decide to use subdomains, you'll need to add an A or CNAME record for the new subdomain on CF as well.

It's because of Cloudflare. CF is providing the required DNS so the domain is working. I see a login prompt when I visit it. The server is fully ready to accept requests for the domain, but our DNS servers are not cooperating for some reason so nobody was able to find it. Our name servers have something wrong with them I think. When I query either of them for your domain, I get "query refused", which is an error I've never seen before. I'd normally have Krydos look into this, but since you're using CF it's a moot point anyway.