I am running a very customised Ubuntu 16.04, with a lot of programs already installed and a lot of other things set up and configured. I want to turn this into a distro/remix/flavour which I can give to friends and other people who want it.

The problem is that I don't know how to create one which uses my system that needs the person who is installing it to create their own user. For example, they go through the regular installation process, and then choose the computer name, user name and password. I don't want it to use my account and password, because the user who uses the distro has a low chance of having the same name as me, and probably wants to install it themselves with their custom settings.

it is also probably worth noting the system is large, if that affects any programs which limit the size of the customised ISO.

Thank you very much for your help, and I apologise if this is a duplicate and it has been answered somewhere.