Right now since it's the winter I would tell you get either to CKS in Buena Vista or to Confluence Kayaks in Denver to sit in some boats and talk to the knowledgeable folks there about proper fitting and advice on used gear. If you are just starting out, fitting will be pretty key and will play a huge role in getting the basics of boat control and rolling down. You would hate to drop cash on gear and boats especially that don't fit properly.
When the spring hits and we get some runoff, CKS has a demo boat program where you pay around $30 bucks and you can put one of their boats on the river. With the Milk Run close by you can't go wrong with this because the money you spend on demoing boats can be used towards the purchase of a new rig.
Aside from that, try and hit up some winter pool sessions, talk to some of the experienced paddlers you meet there and ask to sit in/try out their boats.
Wish you the best of luck in the sport and hope to see you out on the river!