Greetings and salutations,
I can help you install and configure iDempiere on your system. I would recommend using either Ubuntu or Debian as the operating system, because they are widely supported, and because the most recent stable version of iDempiere requires Java 11, as well as a more recent version of Postgresql.
The iDempiere system is not made to be difficult to use, but I will gladly, nevertheless, try to provide you with a bit of training to get you going.
If you are interested, please feel free to send me a message and we can talk in more detail.
Until then,
Best regards.