Hill,
There are several resources I would definitely look into if I were in your shoes (I once was.) CO is a great state to go-to as a first-timer as it is an over-the-counter archery tag and probably has more informational resources than any other state.
The first resource I would go to is the CO Fish & Game website. They offer a tremendous amount of information on elk hunting and additional resources related to it. I hope you have a printer and lots of paper...
The second resource I would check into is the Rocky Mountain Elk Foundation. They regularly list bow-only guides and resources for all of the elk hunting areas. It is also a worthwhile investment to join even as a novice IMO.
Another great resource is the Easton Family's Bowhunting The West magazine. This one is pretty self explanatory.
One thing to keep in mind as you research various guides that I found out through the years... Unfortunately some guides really frown on bowhunters and even more-so on traditional bowhunters. Claiming that they have had too many bad experiences with them. You will not change their mind and if this is the case, you don't want to work with them anyway. You DO want to work with someone who specializes in bowhunting and preferably trad bowhunting! I have been exposed to (never personally hired any) bowhunting guides that think that getting their clients within 50 yards is more than good enough. Do your research and ask them what the guides goals are for you as the hunter. If the guide is decent, they work with you one-on-one to get you an under 20 yard shot and will provide you with all of the information you need well in advance of your trip. YOU need to be totally honest in your assessment of your hunting and shooting skills and of your physical condition to the guide when you do your research. This is absolutely critical as neither of you wants any surprises once you actually meet up. Remember that guides are people too and if they sense that you have been dishonest with them, they can and likely will make your life quite miserable when you are there!