Here's a link to the trail map with coordinates:
http://www.sharetrails.org/uploads/Maps/TrailRideMap0208.jpg
There's 2 main ways to get around in Grand Lake:
1) Stay in a hotel or such in town, and snowmobile right from there. Or, trailer to Idleglenn and sled from there when the snow is poor.
2) Stay in Columbine Lake area, which is even closer to the trailhead, and the riding.
You can just google some lodging, and you'll find a ton. I prefer to rent a house so you can stretch out more with a group. I'm not a fan of hotel rooms, as there's nothing to do.
The snow is pretty poor right now. I went for a trail ride in GL yesterday, and it's pretty thin. You currently need to stay on the trail, as you'll run into land mines if you try to get off it too much yet.
If you're planning for January or later trip, the snow should be fine by then.