url-handling for develop a new site?

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Hi,
when I develope a new Concret5-Site for an older existing site, I want to do this with an extra url (new.my-site.com) on a new server. Later I want only change the DNS-Entry and point the main url (my-site.com) to the new server ip. The server-configs (apache,etc.) are ready for the main-url.

My question: is there any trouble doing that? What have I to change, when switching the DNS-Setting?

Using the search engine with topic like "change url" or "change site" direct me only to the legacy documentation. In older concrete5 versions some changes was to do. Whats today in version 8.5.x to do? Nothing - only have fun? ;)

thanks for your help
trickler