The occasional re-boot is needed for updates and things. Do I need to somehow clear / stop current relay circuits prior to doing a reboot to keep from messing someone up? Or do it just do a tor service stop, reboot, and it will come back to life. Thanks in advance.
You just follow the normal way to stop tor (and start it after you reboot). When you stop tor, it will show you something like:
Jan 27 14:12:23.000 [notice] Interrupt: we have stopped accepting new connections, and will shut down in 30 seconds. Interrupt again to exit now.
This means, it is exiting 'gracefully'.