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OFF:	The highest possible rank and is intended to turn off logging.
ERROR:	Designates error events that might still allow the application to continue running.
WARN:	Designates potentially harmful situations.
INFO:	Designates informational messages that highlight the progress of the application at coarse-grained level.
DEBUG:	Designates fine-grained informational events that are most useful to debug an application.
TRACE:	Designates finer-grained informational events than the DEBUG.
ALL:	All levels including custom levels.

For more guidance on which level to use, see Coding Conventions#Logging

For modifying the log output of a running client, you may use a custom log4j config file by setting a system property at startup.  Besu's logging doc provides good documentation on how to configure logging in Besu.