im going through a rebanding on one of my website with a complete name change (as its close to a competitors name) as i need something different

i have purchased the domain name already have created the new logs and change the logos on the site c but what di i need to change so i can use the new domain name???

config files etc??

also my store is in the root of my webhost server which is on my current domian... hwow do i go about changing the domain name on the server?? i will be contacting my host about this as well.