Here is detail.
1) We will send you complete backup of your live site on old server or domain, which does not mean we will switch off your old domain or that will stop working.
2) We will migrate everything from old domain to new domain.
3) Everything would work on new domain or sub domain perfect all links, images, and settings everything. Not a pixel change even.
Here is what we need to start work.
1) Cpanel or hosting detail of your old site.
2) Cpanel or Hosting info of your new site.
3) Any special instructions about sub domain or sub directory.
4) I also love to hear special instructions if you have.