Never heard of them. Where are they?
When the season starts depends on where the river is. Commercials start running trips out in the Canyonlands in March, they usually do guide training on the Arkansas in May. I'm sure folks would love to help you but you need to be a bit more specific. I know you're sitting in Duluth, but the "Southwest" is a pretty big place.
Where do you want to go? Are you just looking for the first guiding opportunity? Have you tried searching for the answers you're looking for?
Nothing in the world is more yielding and gentle than water. Yet it has no equal for conquering the resistant and tough. The flexible can overcome the unbending; the soft can overcome the hard. - Lao Tse