For getting started there is the quick start guide https://fossil-scm.org/home/doc/trunk/www/quickstart.wiki and after that the built in help gets you pretty far. Really, most distributed version control systems have the same workflow the devil is in the exact syntax used.
As for CI there are pre-commit hooks I suspect could be used for that process. https://fossil-scm.org/home/help/hook and https://fossil-scm.org/home/doc/trunk/www/hooks.md