Easiest way to sell/transfer sites?

Hey guys, I'm planning on offering a mass site-creation service, but before I do this, I need some advice on what the best approach would be. I know some of you guys may have experience with something like this already and I'm just concerned with the specifics of it all.

Since each site will be on a new domain, would it be best for me to include the domain in the price and purchase a new domain using my own godaddy account for each customer, create the site on it, and then transfer the domain? Or would it be better to ask the customers to provide the domains and just ask for their hosting login details?

I want this all to run smoothly, so hopefully someone with experience may suggest a good way to go about it.

Thanks!

Are the domains going to be keyword specific? I mean will the branding of the sites name appear in the site anywhere?

If so I would include the domain and maybe buy cheap hosting, you just give them the log in details then and they have a site up and running with no hassle.

Since each site will be on a new domain, would it be best for me to include the domain in the price and purchase a new domain using my own godaddy account for each customer, create the site on it, and then transfer the domain?

I offer web services as well, so here are my thoughts:

You want to avoid all hassles/interruptions and strive for efficiency. Put differently, you want to limit the chances of your customer becoming annoyed due to incompetence and give them what they want as quickly as possible.

Therefore, my suggestion is that you include the domain in the price, create the site, and then transfer it.

In the end, it's better for both parties and saves a lot of headaches.