Consulting

I've noticed that nearly every old fart around here with a nice boat and time to sail it seems to be a former professional or government type who is now a consultant. I have only the mistiest notion of what consultants are or do, but I am thinking maybe I want to be one. I have devoted at least half of my 28 year scientific career to the development and application of new brain stimulation techniques and actually invented/discovered some useful stuff, so I ought to be of some value to someone.
Does anyone know how to go about gauging one's value and/or setting one's self up as a consultant or have any potentially useful contacts?
Thanks!
E
Does anyone know how to go about gauging one's value and/or setting one's self up as a consultant or have any potentially useful contacts?
Thanks!
E