Training has always been a pain point for many users, not just in Iowa. Below are some options, broken between paid and unpaid:
Author a Viz (this is a link to their starter kits)
Some Tableau partners like ACS here in the metro area provide classroom training
Third party consultants like Ryan Sleeper offer classes, his classes in KC are probably the shortest distance (he might offer something in Des Moines if you contact him directly)
Hope this helps! Also make sure to attend our user group meetings when they start back up again this summer!