The first entry on LibreTime's Help menu offers a Getting Started guide for new users. Further down, there is also a link to the online version of this User Manual.
You can visit the LibreTime online support forum at https://discourse.libretime.org/c/get-help to ask for help from the community regarding your LibreTime setup.
LibreTime needs your input to improve. If you think you've found a bug, please visit https://github.com/LibreTime/libretime. Create a bug report by selecting Issues, then New Issue. That way, the LibreTime team can keep track of your problem and notify you when it has been fixed. You can also suggest improvements and new features for LibreTime on that site.
The UNESCO publication Community Radio - A user's guide to the technology features a very comprehensive guide to setting up a community radio station. This guide is aimed at people thinking about setting up a radio station in India, but includes lots of practical advice that would be useful in any country.