Create a root docker image.

I have a software which installs on a debian 11 system which I need to pack into a docker image together with dependent libraries and some config files (which should be moved to external accessible storage). So I need to create a debian11 image from scratch to include all dependencies and daemons so a docker image can be produced to run these daemons. I need a step by step instruction on how to get this. A standard image should not be used as it has to be100% dependency free on any other image and will run in a protected environment where other images will not be downloadable. Note: This will not run on x86 platform but on arm64