Hello, I am new doing this stuff, but I need help.

I want to start selling pre-made and turnkey websites. How can I change the domain's owner information to a different person.
In the beginning, the domain will be in my name, but when the costumer buys the website from me, i have to eliminate my name and add his name. How much for this.

Thanks

many registrars will do this for free (like godaddy) you can easily change the ownership

Another would be enom

you may wish to avoid 'troublesome' domains like .co.uk, which only allow (easily) change of address & other details but 'NOT Owners Name.
To change owners names on .co.uk is a little more dificult/slower AND costs
about $25

best to stick with .com or .net

good luck

Just ask your buyer to create a free account with your current domain name registrar. Once they did simply free push the domain name into their account. This way you don't need to manually edit/update the domain records. Almost, all major registrar provides this features.

This can be done easily with namecheap.com. It's simply a matter of clicking on a link in your account manager and changing the details there.