Minimize downtime when changing IP's also Moving main website question

I would like to move a site from the server main one.

It is now domain.com

I want to move this to a new server which is external (shared)


But what about the hostname.domain.com will that still
work if I move as I am only moving the above website domain?


Also I was thinking of a dedicated IP on another domain

What is the best way to set this up so it minimises any downtime
of it IP/nameservers etc

Dedicated IP is on the server where the site is now

 

 

 

 

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