I went solo the season before last. I had planned on going with my brother, but he ended up unable to go. I thought about just not going, but my wife said "if you can't go by yourself, how are you...

The Trails Illustrated maps show the trailheads. A big chunk of Colorado is covered by those maps, but not all. So depending on where you are going, that may be a good source.

I haven't used a WM bag, but I do have a Marmot Helium. I was comfortable in temps down to the upper teens last fall. The Helium is a good bag, I don't think you would be disappointed.