You are fortunate to have one of the busiest general aviation airports just a few miles up I-25. Denver Centennial Airport (airport code APA) has numerous flight schools http://centennialairport.com/Business-Directory . Visit them in person and take a discounted intro flight.

If you decide to visit Jeffco (now called Rocky Mountain Airport, code BJC) it's a good hour drive from Castle Rock. And welcome to flyertalk Motor622!