If you have not purchased our webhosting plans, then setting your domain to "Dynadot Hosting" will lead any visitors to your domain to a "Host Not Found" page. If you have a webpage/website you want your domain to point to, you should use one of the other name server settings (domain forwarding, stealth forwarding, etc.).
If you currently do not have a website for your domain, you can choose to park it with the Dynadot Parking option.
Also, if I did a transfer, how do I change the name servers to YOUR servers? I do not longer want to keep my old registrars servers, even if it means I have to pay extra money.
Your existing webserver for your domain will need to generate the CSR. Our web hosting packages are for static websites only, so they are not able to install SSL certificates.