Are we starting from scratch?

No. These websites are pre-made. They are ready to go. In most cases that means they have some age to them. This is important.

Domain Names included?

Each website is different. Sometimes it makes sense to have a separate domain name for each website for sale. Sometimes it is not necessary. Pay attention to the details. The listing will let you know what is included.

Software used?

Here again each website is different. The actual listing will let you know what software program is being used to make the website.