I can help you with various DNS and domain configuration and issue fixing.
A domain is just the name, while the hosting is the web space for the site files. A domain can be pointed from one host to another by changing its nameservers. A domain can also be transferred between registrars without changing the hosting. If you are not very clear how these things work, I can help you.
What I can do for you:
Change the nameservers of a domain to point it to another host
A and MX records so that the site and the emails are managed by
different companies (emails with Google or website with Weebly, for example)
Register child nameservers (ns1.your-domain.com)
Domain forwarding in different ways
Set multiple sub-domains to multiple hosting
Multiple record setup
I can also help you with information about different domain requirements (personal experience) or how to transfer a domain (or assist with the process). I can help you with a lot of other domain issues as well.
As some companies give limited access, please contact me in advance to find out if I can help you! You can also contact me if you have any questions/doubts before or after you order.