Aikido is a tough art to master (those that say it isn't clearly aren't there yet), even tougher is to teach Aikido and run a dojo/ organisation. 

For managing risk, insurance and children's issues see (12 Managing risk, insurance etc ) which were written for our national association. You may also find 11 Hosting Seminars interesting a a shared wisdom on etiquette and tedious things like budgeting ted.. helpful 

See also Aikido as an Elite Sport, Reflections on the Aikido Yuishinkai Syllabus)